javascript 实用函数

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\n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<formObj.length; 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\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.

}

}