javascript_javascript スキルの解析における実践的な関数の使用方法の詳細な説明

コードをコピー コードは次のとおりです:

function addBookMark(url, title){
//将网页添加到收藏addBookMark(window.location,document.title)
    if(document.all){
      window.external.addFavorite(url,title);
    }else if (window.sidebar){
      window.sidebar.addPanel(title,url,'');
    }else{
      alert('添加失败');
    }
}  

function setHomepage(obj,url) {
// setHome(this, window.location)
    try {  
        obj.style.behavior = 'url(#default#homepage)';  
        obj.setHomePage(url);  
    } catch (e) {  
        if (window.netscape) {  
            try {  
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
            } catch (e) {  
                alert('此操作被浏览器拒绝！\n请在浏览器地址栏输入"about:config"并回车 然后将 [signed.applets.codebase_principal_support]的值设置为"true",双击即可。');  
            }  
            var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);  
            prefs.setCharPref('browser.startup.homepage', vrl);  
        }  
    }  
}  

function boxMove(box){
//可移动的层
    var w = box.scrollWidth,h = box.scrollHeight;
    var iWidth = document.documentElement.clientWidth;
    var iHeight = document.documentElement.clientHeight;    
    var moveX = 0,moveY = 0,moveTop = 0,moveLeft = 0,moveable = false;
    box.onmousedown = function(e){   
    moveable = true;    
    e = window.event?window.event:e;
    moveX = e.clientX-box.offsetLeft;       
    moveY = e.clientY-box.offsetTop;
    box.style.zIndex++;
    }
    document.onmousemove = function(e){
        if(moveable){
            e = window.event?window.event:e;       
            var x = e.clientX - moveX;
            var y = e.clientY - moveY;
            if ( x > 0 &&( x + w 0 && (y + h                 box.style.left = x + "px";
                box.style.top = y + "px";
                box.style.margin = "auto";
            }
        }
    }
    document.onmouseup = function (){moveable = false;};
}

function getHtmlRoot(){
/*获得html文档的根元素*/
    if(document.compatMode.toLowerCase()=="css1compat"){
        htmlRoot = document.documentElement;
    }else{
        htmlRoot = document.body;
    }
    return htmlRoot;
}

function showWindow(boxId, closeId, showBg){//弹窗
    htmlRoot = getHtmlRoot();
    box = document.getElementById(boxId);
    boxId = '#' + boxId;
    closeId = '#' + closeId;
    showBox = $(boxId);
    showBox.show();
    z_index = 20;
    moveLeft =  (htmlRoot.clientWidth- box.clientWidth)/2 + htmlRoot.scrollLeft +'px';
    moveTop = (htmlRoot.clientHeight - box.clientHeight)/2 + htmlRoot.scrollTop;+'px';
    showBox.css({position:'absolute', left:moveLeft,zIndex:z_index, top:moveTop});

    boxMove(box);

    if(showBg){
        objMask = document.createElement("div");
        objMask.className = "BoxMask";
        htmlRoot.appendChild(objMask);
        objMask.style.cssText += 'position:absolute;top:0; left:0;filter:Alpha(Opacity=50);opacity:0.5;background:#AAA;';

        objMask.style.zIndex = z_index -1;
        objMask.style.width =  htmlRoot.clientWidth + 'px';
        objMask.style.height = htmlRoot.scrollHeight + htmlRoot.scrollTop + 'px';
    }

    $(closeId).click(function(){
        showBox.hide();
        mybg.style.display = "none";
    });
    $('.closeBtn').click = function(){
        showBox.hide();
        mybg.style.display = "none";   
    };

}

function getFormQuery(formId){
/*生成查询字串*/
    formObj = document.getElementById(formId);
       var i, queryString = "", and = "", itemValue;
       for(i = 0; i             var item = formObj[i];
              if ( item.name!='' ){
                     if(item.type == 'select-one'){
                         itemValue = item.options[item.selectedIndex].value;
                     }else if ( item.type=='checkbox' || item.type=='radio'){
                         if ( item.checked == false ){ continue; }
                         itemValue = item.value;
                     }else if ( item.type == 'button' || item.type == 'submit' || item.type == 'reset' || item.type == 'image'){
                         continue;
                     }else{
                          itemValue = item.value;
                     }
                   //  itemValue = escape(itemValue);
                     queryString += and + item.name + '=' + itemValue;
                     and="&";
                   //queryString += and + encodeURIComponent(item.name) + '=' +encodeURIComponent( itemValue);
              }
       }
       return queryString;
}

//定义js错误处理函数
onerror = errHandle;
function errHandle(msg,url,line){
    var txt=""
    txt = "本页中有错误！ \n"
    txt += "错误: "+ msg +"\n"
    txt += "地址: " + url + "\n"
    txt += "行数: " + line + "\n\n"
    alert(txt);
    return false;
}

function setAutoWidth(id,width,size){
//最小或最大宽度
    var obj = document.getElementById(id);
    if(size=='max'){
        obj.style.width = (obj.clientWidth > width) ? width + "px" : "auto";
    }else{
        obj.style.width = (obj.clientWidth     }
}

function fontScroll(id){
/*向左滚动的文字 */
    var obj = document.getElementById(id);
    var text = obj.innerHTML;
    var first = text.charAt(0);
    var left = text.substring(1, text.length);
    obj.inerHTML = left + first;
    //这个写函数之外 setInterval('fontScroll(id)', 500);
}

function bubbleSort(arr){
/*Bubble sort method*/
var sign = false // Initialize the transposition sign to false
for(var i=0; i for(varj=0; j if(arr[j]> arr[j 1]){
vartemp = arr[j]
arr[j]= arr[j 1]
arr[j 1]= temp
sign= true // If there is a transposition in the current circle comparison , then the substitution mark is true
}
}
if(sign)// Determine whether there has been a substitution in the current circle...
sign= false // If there has been a substitution, retry The replacement bit is marked as false
else
break// If not, terminate
}
return arr;
}

function getCoordinate(evt){
/*Get the coordinates of the cursor*/
var x = evt.clientX;
var y = evt.clientY;
document.getElementById('show' ).innerHTML = x ' &' y;
}

function checkEmail(email){
/*Detect multiple email formats separated by semicolons (;)*/
if(email != null){
if(email.indexOf(" ;",0) == -1){ //indexOf(searched, starting position) returns the position where a certain string first appears in the source string. If it fails, -1
is returned if(!isEmail(email )){
         alert("The format of the single email is incorrect, please re-enter!"); > }else{
var emailArr = email.split(";");//split (separated segment, total length of array) string is divided into string array
var i, iMax = emailArr.length;
for(i = 0; i if(emailArr[i] != null || emailArr != ""){
if(!isEmail(emailArr[i]) ){
alert("One of the multiple email formats is incorrect, please check again before entering!");
document.getElementById("email").focus();
return false ;
}
}
}
}
}
}
function isEmail(str){
var reg = /^(w) (.w )*@(w) ((.w ) )$/;
return reg.test(str);//test (tested string) detects whether a string matches a certain pattern.
}
}