解析javascript 实用函数的使用详解_javascript技巧

复制代码 代码如下:

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 < iWidth) && y > 0 && (y + h < iHeight)){
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 < width) ? width + "px" : "auto";
}
}

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){
/*冒泡排序法*/
var sign = false // 初始化换位标记为假
for(var i=0; i < arr.length-1; i ){
    for(varj=0; j < arr.length-1-i; j ){
        if(arr[j]> arr[j 1]){
            vartemp = arr[j]
            arr[j]= arr[j 1]
            arr[j 1]= temp
            sign= true // 若当前这一圈比较中，有过换位，则置换位标记为真
        }
    }
    if(sign)// 判断当前这一圈有过换位否…
       sign= false // 有过换位，则重置换位标记为假
    else
       break// 没有，则终止
    }
return arr;
}

function getCoordinate(evt){
/*获得光标的坐标*/
    var x = evt.clientX;
    var y = evt.clientY;
    document.getElementById('show').innerHTML = x ' &' y;
}

 

function checkEmail(email){
/*检测多个以分号(;)分隔的Email格式*/
if(email != null){
    if(email.indexOf(";",0) == -1){ //indexOf(被查找，起始位)返某个字符串在源字符串中首次出现的位置，失败返回-1
        if(!isEmail(email)){
            alert("单个邮件格式有误，请重输！");
            document.getElementById("email").focus();
            return false;
        }
    }else{
        var emailArr = email.split(";");//split(分隔段,数组总长度)字符串分割成字符串数组
        var i, iMax = emailArr.length;
        for(i = 0; i < iMax; i ){
            if(emailArr[i] != null || emailArr != ""){
                if(!isEmail(emailArr[i])){
                    alert("多个邮箱格式中有邮箱格式不正确，请重新核对后再输入!");   
                    document.getElementById("email").focus();
                    return false;
                }
            }
        }
    }   
}
function isEmail(str){
   var reg = /^(w) (.w )*@(w) ((.w ) )$/;
   return reg.test(str);//test(被测字串)检测一个字符串是否匹配某个模式.
}
}