Full-screen js avatar upload plug-in source code HD version

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Full-screen js avatar upload plug-in source code HD version_javascript skills

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May 16, 2016 pm 03:07 PM

The example in this article shares the full-screen js avatar upload plug-in source code for your reference. The specific content is as follows

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="Full-screen js avatar upload plug-in source code HD version_javascript skills" > 
      </div> 
    </div> 
    <div id="preb"> 
      <div id="ctnb"> 
        <img  id="imgb"/ alt="Full-screen js avatar upload plug-in source code HD version_javascript skills" > 
      </div> 
    </div> 
    <div id="prec"> 
      <div id="ctnc"> 
        <img  id="imgc"/ alt="Full-screen js avatar upload plug-in source code HD version_javascript skills" > 
      </div> 
    </div> 
  </div> 
 
  <div id="ccp"> 
    <div id="ctn"> 
      <img  id="fixed_img" / alt="Full-screen js avatar upload plug-in source code HD version_javascript skills" > 
      <div id="varied_div"> 
        <img  id="varied_div_img" / alt="Full-screen js avatar upload plug-in source code HD version_javascript skills" > 
        <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 &#63; 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 &#63; 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 &#63; 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 &#63; 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"&#63;"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 &#63; ccp.imgH : cfg.varied_divDEFAULT; 
  } 
  else { 
    ccp.varied_divWH = ccp.imgW < cfg.varied_divDEFAULT &#63; 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; 
}

The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.

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