


L'exemple de cet article partage le code source du plug-in de téléchargement d'avatar js en plein écran pour votre référence. Le contenu spécifique est le suivant
.index.html
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>ccp</title> <link href="Content/ccp.css" rel="stylesheet" /> <script src="Scripts/cxc.js"></script> <script src="Scripts/ccp.js"></script> <script src="Scripts/fun.js"></script> </head> <body> <div id="SelectPicture">选 择 图 片</div> <div id="pre"> <div id="prea"> <div id="ctna"> <img id="imga"/ alt="Code source du plug-in de téléchargement d'avatar js plein écran version HD_compétences javascript" > </div> </div> <div id="preb"> <div id="ctnb"> <img id="imgb"/ alt="Code source du plug-in de téléchargement d'avatar js plein écran version HD_compétences javascript" > </div> </div> <div id="prec"> <div id="ctnc"> <img id="imgc"/ alt="Code source du plug-in de téléchargement d'avatar js plein écran version HD_compétences javascript" > </div> </div> </div> <div id="ccp"> <div id="ctn"> <img id="fixed_img" / alt="Code source du plug-in de téléchargement d'avatar js plein écran version HD_compétences javascript" > <div id="varied_div"> <img id="varied_div_img" / alt="Code source du plug-in de téléchargement d'avatar js plein écran version HD_compétences javascript" > <i id="TopLeft"></i> <i id="TopRight"></i> <i id="BottomRight"></i> <i id="BottomLeft"></i> </div> </div> <div id="black_cover"></div> </div> <div id="bt"> <div id="Y_OUT"> <div id="Y">Y</div> </div> <div id="N_OUT"> <div id="N">N</div> </div> </div> </body> </html>
cxc.js
/* cxc.js 频繁操作公共接口 */ var $ = function (id) { return document.getElementById(id); }; //通过id获取dom对象 var A = function (msg) { alert(msg); }; //alert的简写 var EmptyFun = function () { }; // 空方法 var setL = function (dom, L) { dom.style.left = L + "px"; }; // 设置 dom 的 left var setT = function (dom, T) { dom.style.top = T + "px"; }; // 设置 dom 的 top var setLT = function (dom, L, T) { dom.style.left = L + "px"; dom.style.top = T + "px"; }; //同时设置 dom 的 left top var getLT = function (dom) { return [parseInt(dom.style.left), parseInt(dom.style.top)]; }; // 返回dom的left和top值,类型为整型数组[int,int] var setW = function (W) { dom.style.width = W + "px"; }; // 设置 dom 的 width var setH = function (H) { dom.style.height = H + "px"; }; // 设置 dom 的 height var setWH = function (dom, W, H) { dom.style.width = W + "px"; dom.style.height = H + "px"; }; //同时设置 dom 的 width height var getWH = function (dom) { return [parseInt(dom.style.width), parseInt(dom.style.height)]; }; // 返回dom的 width 和 height 值,类型为整型数组[int,int] var setLTWH = function (dom, L, T, W, H) { dom.style.left = L + "px"; dom.style.top = T + "px"; dom.style.width = W + "px"; dom.style.height = H + "px"; }; //同时设置 dom 的 left top width height var setRTWH = function (dom, R, T, W, H) { dom.style.right = R + "px"; dom.style.top = T + "px"; dom.style.width = W + "px"; dom.style.height = H + "px"; }; //同时设置 dom 的 left top width height var getLTWH = function (dom) { return [parseInt(dom.style.left), parseInt(dom.style.top), parseInt(dom.style.width), parseInt(dom.style.height)] }; // 返回dom的 left top width height 值,类型为整型数组[int,int,int,int] var setcursor = function (dom,shape) { dom.style.cursor = shape; }; //设置鼠标经过dom的指针形状 var EventsType = {//事件类型 click:"click", mousedown:"mousedown", mouseup:"mouseup", mouseover:"mouseover", mouseleave:"mouseleave", mousemove:"mousemove", DOMContentLoaded:"DOMContentLoaded", }; var AddEvent = function (dom, type, fun) { dom.addEventListener(type, fun, false); }; //添加dom对象的事件监听方法 var AddEvent2 = function (dom, type1, fun1, type2, fun2) { dom.addEventListener(type1, fun1, false); dom.addEventListener(type2, fun2, false); }; //一次添加dom的两个事件监听方法 var AddEvent3 = function (dom, type1, fun1, type2, fun2, type3, fun3) { dom.addEventListener(type1, fun1, false); dom.addEventListener(type2, fun2, false); dom.addEventListener(type3, fun3, false); }; //一次添加dom的三个事件监听方法 var DelEvent = function (dom, type, fun) { dom.removeEventListener(type, fun, false); }; // 删除dom对象的事件监听方法 var DelEvent2 = function (dom, type1, fun1, type2, fun2) { dom.removeEventListener(type1, fun1, false); dom.removeEventListener(type2, fun2, false); }; //一次删除dom对象的两个事件监听方法 var DelEvent3 = function (dom, type1, fun1, type2, fun2, type3, fun3) { dom.removeEventListener(type1, fun1, false); dom.removeEventListener(type2, fun2, false); dom.removeEventListener(type3, fun3, false); }; //一次删除dom对象的三个事件监听方法 var inArray = function (str, arr) { for (var i = 0; i < arr.length; i++) { if (str == arr[i]) { return true; } } return false; }; // 判断字符串str是否存在于数组arr var cannotselect = function () { window.getSelection().removeAllRanges(); }; //页面元素(文字、图片等)不能被选中 var setStyle = function (dom, styleName, styleValue) { dom.setAttribute("style", styleName + ":" + styleValue + ";"); }; //设置dom的 一个style 属性值 var setStyle2 = function (dom, styleName1, styleValue1, styleName2, styleValue2) { dom.setAttribute("style", styleName1 + ":" + styleValue1 + ";" + styleName2 + ":" + styleValue2 + ";"); };//一次设置dom的 两个style 属性值 var delStyle = function (dom, styleName) { dom.removeAttribute("style", styleName); };//删除dom的 一个style 属性值 var delStyle2 = function (dom, styleName1, styleName2) { dom.removeAttribute("style", styleName1); dom.removeAttribute("style", styleName2); };//一次删除dom的 两个style 属性值 var setAttr = function (dom, attrName, attrValue) { dom.setAttribute(attrName, attrValue); };// 设置dom的 一个属性值 var setAttr2 = function (dom, attrName1, attrValue1, attrName2, attrValue2) { dom.setAttribute(attrName1, attrValue1); dom.setAttribute(attrName2, attrValue2); };//一次设置dom的 两个属性值 var delAttr = function (dom, attrName) { dom.removeAttribute(attrName); };//删除dom的 一个属性值 var delAttr2 = function (dom, attrName1, attrName2) { dom.removeAttribute(attrName1); dom.removeAttribute(attrName2); };//删除dom 的两个属性值 var Hide = function (dom) { dom.style.display = "none"; };// 隐藏dom var Hide3 = function (dom1,dom2,dom3) { dom1.style.display = "none"; dom2.style.display = "none"; dom3.style.display = "none"; };// 隐藏3个dom var Show = function (dom) { dom.style.display = "inline"; }; // 显示dom var Show3 = function (dom1, dom2, dom3) { dom1.style.display = "inline"; dom2.style.display = "inline"; dom3.style.display = "inline"; };// 显示3个dom /* cxc.js 频繁操作公共接口 */ /* AJAX 接口 */ var url, method, msg; var xmlReq = new XMLHttpRequest(); var AJAX = function (url, method, msg, callback) { xmlReq.open(method, url, true); xmlReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlReq.onreadystatechange = function () { if (xmlReq.readyState == 4) { if (xmlReq.status == 200) { callback(); } else { A("ajax status is " + xmlReq.status); } } }; xmlReq.send(msg); }; /* AJAX 接口 */ /* 入口 */ var start = function (fun) { var begin = function () { DelEvent(document, EventsType.DOMContentLoaded, begin); fun(); }; AddEvent(document, EventsType.DOMContentLoaded, begin); }; /* 入口 */ /* 环境 */ var screenW = window.innerWidth; var screenH = window.innerHeight; /* 环境 */
ccp.js
var cfg = { imgtype: ["image/jpeg", "image/png", "image/gif", "image/bmp"], imgsize: 5 * 1024 * 1024, varied_divMIN: 50, varied_divDEFAULT: 100, needWH:0, }; var dom = { body: null, SelectPicture: null, upfile: null, pre: null, ccp: null, bt: null, prea: null, preb: null, prec: null, ctna: null, ctnb: null, ctnc: null, imga: null, imgb: null, imgc: null, Y_OUT: null, N_OUT: null, Y: null, N: null, ctn: null, black_cover: null, fixed_img: null, varied_div: null, varied_div_img: null, TopLeft: null, TopRight: null, BottomRight: null, BottomLeft: null, }; var ccp = { SelectPictureW: null, SelectPictureH: null, SelectPictureP1: 9, SelectPictureP2: 4, SelectPictureL: null, SelectPictureT: null, SelectPictureFontSize: null, /////////////////////////// file: null, imgtype: null, imgsize: null, /////////////////////////// imgW: null, imgH: null, imgN: null, imgURL: null, ////////////////////////// preW: null, preH: null, ccpW: null, ccpH: null, btW: null, btH: null, ///////////////////////// pre4: null, preaL: null, preaT: null, preaWH: null, prebL: null, prebT: null, prebWH: null, precL: null, precT: null, precWH: null, ctnLT: 3, ctnaWH: null, ctnbWH: null, ctncWH: null, ////////////////////////// YN3: null, YN_OUTWH: null, YNWH: null, YN_OUTR: null, Y_OUTT: null, N_OUTT: null, YNLT1: 25, YNLT2: 20, ////////////////////////// ctnL: null, ctnT: null, black_coverL: null, black_coverT: null, ///////////////////////// varied_divL: null, varied_divT: null, varied_divWH: null, varied_divMaxL: null, varied_divMaxT: null, varied_div_imgWH: null, varied_div_imgL: null, varied_div_imgT: null, ///////////////////////// imgaW: null, imgaH: null, imgaL: null, imgaT: null, imgbW: null, imgbH: null, imgbL: null, imgbT: null, imgcW: null, imgcH: null, imgcL: null, imgcT: null, ///////////////////////// }; var GET_DOM = function () { dom.body = document.body; dom.pre = $("pre"); dom.ccp = $("ccp"); dom.bt = $("bt"); dom.SelectPicture = $("SelectPicture"); dom.prea = $("prea"); dom.preb = $("preb"); dom.prec = $("prec"); dom.ctna = $("ctna"); dom.ctnb = $("ctnb"); dom.ctnc = $("ctnc"); dom.imga = $("imga"); dom.imgb = $("imgb"); dom.imgc = $("imgc"); dom.Y_OUT = $("Y_OUT"); dom.N_OUT = $("N_OUT"); dom.Y = $("Y"); dom.N = $("N"); dom.ctn = $("ctn"); dom.black_cover = $("black_cover"); dom.fixed_img = $("fixed_img"); dom.varied_div = $("varied_div"); dom.varied_div_img = $("varied_div_img"); dom.TopLeft = $("TopLeft"); dom.TopRight = $("TopRight"); dom.BottomRight = $("BottomRight"); dom.BottomLeft = $("BottomLeft"); }; var INIT_DOM = function () { setStyle2(dom.body, "width", screenW + "px", "height", screenH + "px"); dom.body.style.backgroundImage = get_random_bgimg(7);///////////////////// set_SelectPictureW(Math.floor(screenW / ccp.SelectPictureP1)); AddEvent2(dom.SelectPicture, EventsType.mouseover, SelectPicture_mouseover, EventsType.mouseleave, SelectPicture_mouseleave); AddEvent(dom.SelectPicture, EventsType.click, SelectPicture_click);///////////////////// ccp.preH = ccp.ccpH = ccp.btH = screenH - 2; ccp.ccpW = screenH + 100 - 2; ccp.preW = Math.ceil((screenW - (ccp.ccpW + 2)) / 2) - 2; ccp.btW = screenW - (ccp.ccpW + 2) - (ccp.preW + 2) - 2; setStyle2(dom.pre, "width", ccp.preW + "px", "height", ccp.preH + "px"); setStyle2(dom.ccp, "width", ccp.ccpW + "px", "height", ccp.ccpH + "px"); setStyle2(dom.bt, "width", ccp.btW + "px", "height", ccp.btH + "px"); Hide3(dom.pre, dom.ccp, dom.bt);///////////////////// }; var EVENTS = function () { AddEvent(dom.varied_div, EventsType.mousedown, varied_div_mousedown);//varied_div AddEvent(dom.TopLeft, EventsType.mousedown, TopLeft_mousedown);//TopLeft AddEvent(dom.TopRight, EventsType.mousedown, TopRight_mousedown);//TopRight AddEvent(dom.BottomRight, EventsType.mousedown, BottomRight_mousedown);//BottomRight AddEvent(dom.BottomLeft, EventsType.mousedown, BottomLeft_mousedown);//BottomLeft AddEvent(dom.Y, EventsType.click, Y_click);//Y AddEvent(dom.N, EventsType.click, N_click);//N }; var END = function () { AddEvent(document, EventsType.mousemove, cannotselect); }; start(function () { GET_DOM(); INIT_DOM(); EVENTS(); END(); });
fun.js
var get_random_bgimg = function (n) { var m = Math.floor(Math.random() * n); var r = "url(Images/bg" + 6 + ".png)"; return r; }; var set_SelectPictureW = function (W) { ccp.SelectPictureW = W; ccp.SelectPictureH = Math.floor(ccp.SelectPictureW / ccp.SelectPictureP2); ccp.SelectPictureL = Math.floor((screenW - ccp.SelectPictureW) / 2); ccp.SelectPictureT = Math.floor((screenH - ccp.SelectPictureH) / 2); ccp.SelectPictureFontSize = Math.floor(ccp.SelectPictureH / 1.5); setStyle(dom.SelectPicture, "font-size", ccp.SelectPictureFontSize + "px"); setLTWH(dom.SelectPicture, ccp.SelectPictureL, ccp.SelectPictureT, ccp.SelectPictureW, ccp.SelectPictureH); }; var SelectPicture_mouseover = function () { set_SelectPictureW(ccp.SelectPictureW + 15); }; var SelectPicture_mouseleave = function () { set_SelectPictureW(ccp.SelectPictureW - 15); }; /////////////////////////////////////////////////// var downX, downY, oldL, oldT, tempWH, tempL, tempT, dxMax, tempMaxL, tempMaxT; var varied_divLimit = function () { if (ccp.varied_divL < 0) ccp.varied_divL = 0; else if (ccp.varied_divL > ccp.varied_divMaxL) ccp.varied_divL = ccp.varied_divMaxL; if ((ccp.varied_divT < 0)) ccp.varied_divT = 0; else if (ccp.varied_divT > ccp.varied_divMaxT) ccp.varied_divT = ccp.varied_divMaxT; }; var varied_div_mousedown = function (e) { if (e.button > 0) { varied_div_mouseup(); return false; } e.preventDefault && e.preventDefault(); downX = e.clientX; downY = e.clientY; oldL = ccp.varied_divL; oldT = ccp.varied_divT; AddEvent2(document, EventsType.mouseup, varied_div_mouseup, EventsType.mousemove, doc_varied_div_mousemove); }; var doc_varied_div_mousemove = function (e) { ccp.varied_divL = oldL + e.clientX - downX; ccp.varied_divT = oldT + e.clientY - downY; varied_divLimit(); setLT(dom.varied_div, ccp.varied_divL, ccp.varied_divT); setvaried_div_img(); setpreimg(); }; var varied_div_mouseup = function () { DelEvent2(document, EventsType.mouseup, varied_div_mouseup, EventsType.mousemove, doc_varied_div_mousemove); }; //////////////////////////////////////////////////// var TopLeft_mousedown = function (e) { if (e.button > 0) { TopLeft_mouseup(); return false; } e.preventDefault && e.preventDefault(); downX = e.clientX; downY = e.clientY; oldL = ccp.varied_divL; oldT = ccp.varied_divT; tempWH = ccp.varied_divWH; tempL = ccp.varied_divL; tempT = ccp.varied_divT; tempMaxL = ccp.varied_divMaxL; tempMaxT = ccp.varied_divMaxT; dxMax = tempL >= tempT ? tempT : tempL; AddEvent2(document, EventsType.mouseup, TopLeft_mouseup, EventsType.mousemove, doc_TopLeft_mousemove); }; var doc_TopLeft_mousemove = function (e) { varied_div_mouseup();//移动事件屏蔽,非常重要 var dx = e.clientY - downY; if (dx < 0 && Math.abs(dx) > dxMax) { dx = -dxMax; } else if (dx > 0 && dx > tempWH - cfg.varied_divMIN) { dx = tempWH - cfg.varied_divMIN; } ccp.varied_divMaxL = tempMaxL + dx; ccp.varied_divMaxT = tempMaxT + dx; ccp.varied_divL = oldL + dx; ccp.varied_divT = oldT + dx; ccp.varied_divWH = tempWH - dx; setLTWH(dom.varied_div, ccp.varied_divL, ccp.varied_divT, ccp.varied_divWH, ccp.varied_divWH); setvaried_div_img(); setpreimg(); }; var TopLeft_mouseup = function () { DelEvent2(document, EventsType.mouseup, TopLeft_mouseup, EventsType.mousemove, doc_TopLeft_mousemove); }; //////////////////////////////////////////////////// var TopRight_mousedown = function (e) { if (e.button > 0) { TopRight_mouseup(); return false; } e.preventDefault && e.preventDefault(); downX = e.clientX; downY = e.clientY; oldL = ccp.varied_divL; oldT = ccp.varied_divT; tempWH = ccp.varied_divWH; tempL = ccp.imgW - ccp.varied_divL - ccp.varied_divWH; tempT = ccp.varied_divT; tempMaxL = ccp.varied_divMaxL; tempMaxT = ccp.varied_divMaxT; dxMax = tempL >= tempT ? tempT : tempL; AddEvent2(document, EventsType.mouseup, TopRight_mouseup, EventsType.mousemove, doc_TopRight_mousemove); }; var doc_TopRight_mousemove = function (e) { varied_div_mouseup();//移动事件屏蔽,非常重要 var dx = e.clientY - downY; if (dx < 0 && Math.abs(dx) > dxMax) { dx = -dxMax; } else if (dx > 0 && dx > tempWH - cfg.varied_divMIN) { dx = tempWH - cfg.varied_divMIN; } ccp.varied_divMaxL = tempMaxL + dx; ccp.varied_divMaxT = tempMaxT + dx; ccp.varied_divL = oldL; ccp.varied_divT = oldT + dx; ccp.varied_divWH = tempWH - dx; setLTWH(dom.varied_div, ccp.varied_divL, ccp.varied_divT, ccp.varied_divWH, ccp.varied_divWH); setvaried_div_img(); setpreimg(); }; var TopRight_mouseup = function () { DelEvent2(document, EventsType.mouseup, TopRight_mouseup, EventsType.mousemove, doc_TopRight_mousemove); }; /////////////////////////////////////////////////// var BottomRight_mousedown = function (e) { if (e.button > 0) { BottomRight_mouseup(); return false; } e.preventDefault && e.preventDefault(); downX = e.clientX; downY = e.clientY; oldL = ccp.varied_divL; oldT = ccp.varied_divT; tempWH = ccp.varied_divWH; tempL = ccp.imgW - ccp.varied_divL - ccp.varied_divWH; tempT = ccp.imgH - ccp.varied_divT - ccp.varied_divWH; tempMaxL = ccp.varied_divMaxL; tempMaxT = ccp.varied_divMaxT; dxMax = tempL >= tempT ? tempT : tempL; AddEvent2(document, EventsType.mouseup, BottomRight_mouseup, EventsType.mousemove, doc_BottomRight_mousemove); }; var doc_BottomRight_mousemove = function (e) { varied_div_mouseup();//移动事件屏蔽,非常重要 var dx = e.clientY - downY; if (dx > 0 && dx > dxMax) { dx = dxMax; } else if (dx < 0 && Math.abs(dx) > tempWH - cfg.varied_divMIN) { dx = -(tempWH - cfg.varied_divMIN); } ccp.varied_divMaxL = tempMaxL - dx; ccp.varied_divMaxT = tempMaxT - dx; ccp.varied_divL = oldL; ccp.varied_divT = oldT; ccp.varied_divWH = tempWH + dx; setLTWH(dom.varied_div, ccp.varied_divL, ccp.varied_divT, ccp.varied_divWH, ccp.varied_divWH); setvaried_div_img(); setpreimg(); }; var BottomRight_mouseup = function () { DelEvent2(document, EventsType.mouseup, BottomRight_mouseup, EventsType.mousemove, doc_BottomRight_mousemove); }; /////////////////////////////////////////////////// var BottomLeft_mousedown = function (e) { if (e.button > 0) { BottomLeft_mouseup(); return false; } e.preventDefault && e.preventDefault(); downX = e.clientX; downY = e.clientY; oldL = ccp.varied_divL; oldT = ccp.varied_divT; tempWH = ccp.varied_divWH; tempL = ccp.varied_divL; tempT = ccp.imgH - ccp.varied_divT - ccp.varied_divWH; tempMaxL = ccp.varied_divMaxL; tempMaxT = ccp.varied_divMaxT; dxMax = tempL >= tempT ? tempT : tempL; AddEvent2(document, EventsType.mouseup, BottomLeft_mouseup, EventsType.mousemove, doc_BottomLeft_mousemove); }; var doc_BottomLeft_mousemove = function (e) { varied_div_mouseup();//移动事件屏蔽,非常重要 var dx = e.clientY - downY; if (dx > 0 && dx > dxMax) { dx = dxMax; } else if (dx < 0 && Math.abs(dx) > tempWH - cfg.varied_divMIN) { dx = -(tempWH - cfg.varied_divMIN); } ccp.varied_divMaxL = tempMaxL - dx; ccp.varied_divMaxT = tempMaxT - dx; ccp.varied_divL = oldL - dx; ccp.varied_divT = oldT; ccp.varied_divWH = tempWH + dx; setLTWH(dom.varied_div, ccp.varied_divL, ccp.varied_divT, ccp.varied_divWH, ccp.varied_divWH); setvaried_div_img(); setpreimg(); }; var BottomLeft_mouseup = function () { DelEvent2(document, EventsType.mouseup, BottomLeft_mouseup, EventsType.mousemove, doc_BottomLeft_mousemove); }; /////////////////////////////////////////////////// var getDATA = function () { var parameter = location.search; //获取url中"?"符后的字串 if (parameter.length == 0) { return 666; } else { var ss = parameter.split("&"); url = ss[0].split("=")[1]; cfg.needWH = ss[1].split("=")[1]; } if (url.length == 0) { return 777; } else if (cfg.needWH == 0) { return 888; } else if (cfg.needWH > 1000) { return 999; } var canvas = document.createElement("canvas"); canvas.style.display = "none"; var ctx = canvas.getContext("2d"); ctx.fillStyle = "#FFFFFF"; canvas.width = canvas.height = cfg.needWH; ctx.fillRect(0, 0, cfg.needWH, cfg.needWH); var a = Math.ceil(ccp.varied_divL * ccp.imgN); var b = Math.ceil(ccp.varied_divT * ccp.imgN); var c = Math.ceil(ccp.varied_divWH * ccp.imgN); ctx.drawImage(dom.fixed_img, a, b, c, c, 0, 0, cfg.needWH, cfg.needWH); return canvas.toDataURL(ccp.imgtype, 1); }; var callback = function () { var txt = xmlReq.responseText; alert(txt); window.opener = null; window.open('', '_self'); window.close(); }; var Y_click = function () { var DATA = getDATA(); DATA == 666 && alert("没有参数"); DATA == 777 && alert("没有返回地址"); DATA == 888 && alert("未给出返回图片大小"); DATA == 999 && alert("图片大小不能超过 1000 X 1000"); if (DATA == 666 || DATA == 777 || DATA == 888 || DATA == 999) { window.opener = null; window.open('', '_self'); window.close(); }//没有参数或参数错误关闭页面 method = "post"; msg = ""; AJAX(url, method, "DATA=" + DATA, callback); }; var N_click = function () { Hide3(dom.pre, dom.ccp, dom.bt); }; /////////////////////////////////////////////////// var check_imgtype = function () { if (!inArray(ccp.imgtype, cfg.imgtype)) { alert("请选择正确的图片类型"); return false; } else { return true; } }; var check_imgsize = function () { if (ccp.imgsize > cfg.imgsize) { alert("图片不能超过"+(cfg.imgsize/1024)/1024+"M"); return false; } else { return true; } }; var set_pre = function () { ccp.preaWH = Math.round(ccp.preW * 0.6); ccp.prebWH = Math.round(ccp.preW * 0.5); ccp.precWH = Math.round(ccp.preW * 0.4); ccp.preaL = Math.round((ccp.preW - ccp.preaWH) / 2); ccp.prebL = Math.round((ccp.preW - ccp.prebWH) / 2); ccp.precL = Math.round((ccp.preW - ccp.precWH) / 2); ccp.pre4 = Math.round((ccp.preH - ccp.preaWH - ccp.prebWH - ccp.precWH) / 4); ccp.preaT = ccp.pre4; ccp.prebT = ccp.pre4 * 2 + ccp.preaWH; ccp.precT = ccp.pre4 * 3 + ccp.preaWH + ccp.prebWH; setLTWH(dom.prea, ccp.preaL, ccp.preaT, ccp.preaWH, ccp.preaWH); setLTWH(dom.preb, ccp.prebL, ccp.prebT, ccp.prebWH, ccp.prebWH); setLTWH(dom.prec, ccp.precL, ccp.precT, ccp.precWH, ccp.precWH); //////////////////////////////////////////////////////////////// ccp.ctnaWH = ccp.preaWH - ccp.ctnLT * 2; ccp.ctnbWH = ccp.prebWH - ccp.ctnLT * 2; ccp.ctncWH = ccp.precWH - ccp.ctnLT * 2; setLTWH(dom.ctna, ccp.ctnLT, ccp.ctnLT, ccp.ctnaWH, ccp.ctnaWH); setLTWH(dom.ctnb, ccp.ctnLT, ccp.ctnLT, ccp.ctnbWH, ccp.ctnbWH); setLTWH(dom.ctnc, ccp.ctnLT, ccp.ctnLT, ccp.ctncWH, ccp.ctncWH); dom.imga.src = dom.imgb.src = dom.imgc.src = ccp.imgURL; }; var setYN = function (dom, n) { ccp.YNWH = ccp.YN_OUTWH - n * 2; setStyle(dom, "font-size", Math.floor(ccp.YNWH * 0.9) + "px"); setLTWH(dom, n, n, ccp.YNWH, ccp.YNWH); }; var Y_mouseover = function () { setYN(dom.Y, ccp.YNLT2); }; var Y_mouseleave = function () { setYN(dom.Y, ccp.YNLT1); }; var N_mouseover = function () { setYN(dom.N, ccp.YNLT2); }; var N_mouseleave = function () { setYN(dom.N, ccp.YNLT1); }; var set_bt = function () { ccp.YN_OUTWH = Math.round(ccp.btW * 0.6); ccp.YN_OUTR = Math.round((ccp.btW - ccp.YN_OUTWH) / 2); ccp.YN3 = Math.round((ccp.btH - ccp.YN_OUTWH * 2) / 3); ccp.Y_OUTT = ccp.YN3; ccp.N_OUTT = ccp.YN3 * 2 + ccp.YN_OUTWH; setRTWH(dom.Y_OUT, ccp.YN_OUTR, ccp.Y_OUTT, ccp.YN_OUTWH, ccp.YN_OUTWH); setRTWH(dom.N_OUT, ccp.YN_OUTR, ccp.N_OUTT, ccp.YN_OUTWH, ccp.YN_OUTWH); setYN(dom.Y, ccp.YNLT1); setYN(dom.N, ccp.YNLT1); AddEvent2(dom.Y, EventsType.mouseover, Y_mouseover, EventsType.mouseleave, Y_mouseleave); AddEvent2(dom.N, EventsType.mouseover, N_mouseover, EventsType.mouseleave, N_mouseleave); }; var setvaried_div = function () { if (ccp.imgW > ccp.imgH) { ccp.varied_divWH = ccp.imgH < cfg.varied_divDEFAULT ? ccp.imgH : cfg.varied_divDEFAULT; } else { ccp.varied_divWH = ccp.imgW < cfg.varied_divDEFAULT ? ccp.imgW : cfg.varied_divDEFAULT; } ccp.varied_divL = Math.round((ccp.imgW - ccp.varied_divWH) / 2); ccp.varied_divT = Math.round((ccp.imgH - ccp.varied_divWH) / 2); ccp.varied_divMaxL = ccp.imgW - ccp.varied_divWH; ccp.varied_divMaxT = ccp.imgH - ccp.varied_divWH; setLTWH(dom.varied_div, ccp.varied_divL, ccp.varied_divT, ccp.varied_divWH, ccp.varied_divWH); }; var setvaried_div_img = function () { ccp.varied_div_imgL = -ccp.varied_divL; ccp.varied_div_imgT = -ccp.varied_divT; setLT(dom.varied_div_img, ccp.varied_div_imgL, ccp.varied_div_imgT); }; var setpreimg = function () { var p1, p2, p3; p1 = ccp.ctnaWH / ccp.varied_divWH; p2 = ccp.ctnbWH / ccp.varied_divWH; p3 = ccp.ctncWH / ccp.varied_divWH; ccp.imgaW = Math.round(p1 * ccp.imgW); ccp.imgaH = Math.round(p1 * ccp.imgH); ccp.imgaL = Math.round(p1 * ccp.varied_div_imgL); ccp.imgaT = Math.round(p1 * ccp.varied_div_imgT); ccp.imgbW = Math.round(p2 * ccp.imgW); ccp.imgbH = Math.round(p2 * ccp.imgH); ccp.imgbL = Math.round(p2 * ccp.varied_div_imgL); ccp.imgbT = Math.round(p2 * ccp.varied_div_imgT); ccp.imgcW = Math.round(p3 * ccp.imgW); ccp.imgcH = Math.round(p3 * ccp.imgH); ccp.imgcL = Math.round(p3 * ccp.varied_div_imgL); ccp.imgcT = Math.round(p3 * ccp.varied_div_imgT); setLTWH(dom.imga, ccp.imgaL, ccp.imgaT, ccp.imgaW, ccp.imgaH); setLTWH(dom.imgb, ccp.imgbL, ccp.imgbT, ccp.imgbW, ccp.imgbH); setLTWH(dom.imgc, ccp.imgcL, ccp.imgcT, ccp.imgcW, ccp.imgcH); }; var set_ccp = function () { ccp.ctnL = ccp.preW + 3 + Math.ceil((ccp.ccpW - ccp.imgW) / 2); ccp.ctnT = 1 + Math.ceil((ccp.ccpH - ccp.imgH) / 2); setLTWH(dom.ctn, ccp.ctnL, ccp.ctnT, ccp.imgW, ccp.imgH); ccp.black_coverL = ccp.preW + 3; ccp.black_coverT = 1; setLTWH(dom.black_cover, ccp.black_coverL, ccp.black_coverT, ccp.ccpW, ccp.ccpH); setLTWH(dom.fixed_img, 0, 0, ccp.imgW, ccp.imgH); dom.fixed_img.src = ccp.imgURL; setvaried_div(); setWH(dom.varied_div_img, ccp.imgW, ccp.imgH); dom.varied_div_img.src = ccp.imgURL; setvaried_div_img(); setpreimg(); }; var setStart = function () { set_pre(); set_bt(); set_ccp(); Show3(dom.pre, dom.ccp, dom.bt); }; var setImgWH = function (src, type) { var image = new Image(); image.onload = function () { var width = this.width, height = this.height;//图片的宽高 var p = width / height; if (p > 1) { if (p > ccp.ccpW / 50) { alert("图片宽高比不能超过" + p); return; } else { if (height < 50) { ccp.imgN = height / 50; ccp.imgH = 50; ccp.imgW = Math.round(ccp.imgH * p); } else if (width > ccp.ccpW) { ccp.imgN = width / ccp.ccpW; ccp.imgW = ccp.ccpW; ccp.imgH = Math.round(ccp.imgW / p); } else { ccp.imgN = 1; ccp.imgW = width; ccp.imgH = height; } } } else { if (p < 50 / ccp.ccpH) { alert("图片宽高比不能小于" + p); return; } else { if (width < 50) { ccp.imgN = width / 50; ccp.imgW = 50; ccp.imgH = Math.round(ccp.imgW / p); } else if (height > ccp.ccpH) { ccp.imgN = height / ccp.ccpH; ccp.imgH = ccp.ccpH; ccp.imgW = Math.round(ccp.imgH * p); } else { ccp.imgN = 1; ccp.imgW = width; ccp.imgH = height; } } } ccp.imgURL = this.src; delete image; setStart(); }; image.onerror = function () { alert("图片已损坏,请上传正确图片"); }; image.src = src; }; var SelectPicture_click = function () { dom.upfile = document.createElement("input"); setAttr2(dom.upfile, "type", "file", "id", "upfile"); dom.upfile.click(); dom.upfile.onchange = function () { ccp.file = this.files[0]; ccp.imgtype = ccp.file.type; if (!check_imgtype()) { return; } //检查文件类型 ccp.imgsize = ccp.file.size; if (!check_imgsize()) { return; }; //检查图片大小 var reader = new FileReader(); reader.onload = function () { setImgWH(this.result, ccp.imgtype); }; reader.readAsDataURL(ccp.file); }; };
ccp.css
*{ margin:0px; padding:0px; } #SelectPicture{ position:absolute; border:3px solid #ff6a00; border-radius:8px; color:#ff6a00; text-align:center; font-family:'Microsoft YaHei'; cursor:pointer; } #upfile{ display:none; } #pre,#ccp,#bt{ float:left; z-index:1; border:1px solid #ffffff; } #ccp{ border:1px dashed #808080; border-left:1px dashed #808080; border-right:1px dashed #808080; } #prea,#preb,#prec{ position:absolute; background-color:#ff6a00; border-radius:7px; } #ctna,#ctnb,#ctnc{ position:absolute; background-color:#ffffff; overflow:hidden; } #imga,#imgb,#imgc{ position:absolute; left:0px; top:0px; } #Y_OUT,#N_OUT{ position:absolute; } #Y,#N{ /* background-color:#ff6a00;*/ position:absolute; text-align:center; border:3px solid #ff6a00; border-radius:50%; color:#ff6a00; font-family:Arial; cursor:pointer; } #ctn{ position:absolute; background-color:blueviolet; overflow:hidden; } #black_cover{ position:absolute; background-color:black; opacity:0.6; z-index:3; } #fixed_img{ position:absolute; } #varied_div{ position:absolute; z-index:4; overflow: hidden; cursor:move; } #BottomRight,#TopRight,#TopLeft,#BottomLeft { background:#D6FB66; display:block; width:6px; height:6px; position:absolute; z-index:5; bottom:0; right:0; cursor:nw-resize; } #BottomLeft { bottom:0; left:0; cursor:ne-resize; } #TopRight { top:0; right:0; cursor:ne-resize; } #TopLeft { top:0; left:0; cursor:nw-resize; } #varied_div_img{ position:absolute; z-index:5; }
Ce qui précède représente l'intégralité du contenu de cet article. J'espère qu'il sera utile à tout le monde dans l'apprentissage de la programmation javascript.

Les principales utilisations de JavaScript dans le développement Web incluent l'interaction client, la vérification du formulaire et la communication asynchrone. 1) Mise à jour du contenu dynamique et interaction utilisateur via les opérations DOM; 2) La vérification du client est effectuée avant que l'utilisateur ne soumette les données pour améliorer l'expérience utilisateur; 3) La communication de rafraîchissement avec le serveur est réalisée via la technologie AJAX.

Comprendre le fonctionnement du moteur JavaScript en interne est important pour les développeurs car il aide à écrire du code plus efficace et à comprendre les goulots d'étranglement des performances et les stratégies d'optimisation. 1) Le flux de travail du moteur comprend trois étapes: analyse, compilation et exécution; 2) Pendant le processus d'exécution, le moteur effectuera une optimisation dynamique, comme le cache en ligne et les classes cachées; 3) Les meilleures pratiques comprennent l'évitement des variables globales, l'optimisation des boucles, l'utilisation de const et de locations et d'éviter une utilisation excessive des fermetures.

Python convient plus aux débutants, avec une courbe d'apprentissage en douceur et une syntaxe concise; JavaScript convient au développement frontal, avec une courbe d'apprentissage abrupte et une syntaxe flexible. 1. La syntaxe Python est intuitive et adaptée à la science des données et au développement back-end. 2. JavaScript est flexible et largement utilisé dans la programmation frontale et côté serveur.

Python et JavaScript ont leurs propres avantages et inconvénients en termes de communauté, de bibliothèques et de ressources. 1) La communauté Python est amicale et adaptée aux débutants, mais les ressources de développement frontal ne sont pas aussi riches que JavaScript. 2) Python est puissant dans les bibliothèques de science des données et d'apprentissage automatique, tandis que JavaScript est meilleur dans les bibliothèques et les cadres de développement frontaux. 3) Les deux ont des ressources d'apprentissage riches, mais Python convient pour commencer par des documents officiels, tandis que JavaScript est meilleur avec MDNWEBDOCS. Le choix doit être basé sur les besoins du projet et les intérêts personnels.

Le passage de C / C à JavaScript nécessite de s'adapter à la frappe dynamique, à la collecte des ordures et à la programmation asynchrone. 1) C / C est un langage dactylographié statiquement qui nécessite une gestion manuelle de la mémoire, tandis que JavaScript est dynamiquement typé et que la collecte des déchets est automatiquement traitée. 2) C / C doit être compilé en code machine, tandis que JavaScript est une langue interprétée. 3) JavaScript introduit des concepts tels que les fermetures, les chaînes de prototypes et la promesse, ce qui améliore la flexibilité et les capacités de programmation asynchrones.

Différents moteurs JavaScript ont des effets différents lors de l'analyse et de l'exécution du code JavaScript, car les principes d'implémentation et les stratégies d'optimisation de chaque moteur diffèrent. 1. Analyse lexicale: convertir le code source en unité lexicale. 2. Analyse de la grammaire: générer un arbre de syntaxe abstrait. 3. Optimisation et compilation: générer du code machine via le compilateur JIT. 4. Exécuter: Exécutez le code machine. Le moteur V8 optimise grâce à une compilation instantanée et à une classe cachée, SpiderMonkey utilise un système d'inférence de type, résultant en différentes performances de performances sur le même code.

Les applications de JavaScript dans le monde réel incluent la programmation côté serveur, le développement des applications mobiles et le contrôle de l'Internet des objets: 1. La programmation côté serveur est réalisée via Node.js, adaptée au traitement de demande élevé simultané. 2. Le développement d'applications mobiles est effectué par le reactnatif et prend en charge le déploiement multiplateforme. 3. Utilisé pour le contrôle des périphériques IoT via la bibliothèque Johnny-Five, adapté à l'interaction matérielle.

J'ai construit une application SAAS multi-locataire fonctionnelle (une application EdTech) avec votre outil technologique quotidien et vous pouvez faire de même. Premièrement, qu'est-ce qu'une application SaaS multi-locataire? Les applications saas multi-locataires vous permettent de servir plusieurs clients à partir d'un chant


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