一些比较实用的javascript方法收集，留着有用

动态加载javascript文件 

<script type="text/javascript">

//<!--

/*动态加载方法*/

function loadScript(url, callback){

  var script = document.createElement("script");

  script.type = "text/javascript";

  if(script.readyState){

  //IE

    script.onreadystatechange = function (){

      if(script.readyState == "loaded" || script.readyState == 'complete'){

        script.onreadystatechange = null;

        callback();

      }

    };

  }else{

  //其他浏览器

    script.onload = function (){

      callback();

    };

  }

  script.src = url;

  document.getElementsByTagName("head")[0].appendChild(script);

};

/*

 * 以下代码是先加载jquery-1.5.1.min.js，等待jquery-1.5.1.min.js加载完之后

 * 再加载file2.js，以此类推最后加载file3.js

*/

loadScript("js/jquery-1.5.1.min.js", function(){

  loadScript("file2.js", function(){

    loadScript("file3.js", function(){

      alert("All files are loaded!");

    });

  });

});

//-->

</script>  

function GetXmlHttpReuqest(){

    var xmlHttp=null;

    try

    {

        xmlHttp = new XMLHttpRequest();  //对于firefox chrome等浏览器

    }

    catch(e)

    {

        try

        {

            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); //对于IE浏览器

        }

        catch(e)

        {

            try

            {

                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

            }

            catch(e)

            {

                xmlHttp = false;

            }

        }

    }  

return false;

}  

//js判断浏览器

<script>

window["MzBrowser"]={};

(function(){

    if(MzBrowser.platform) return;

    var ua = window.navigator.userAgent;

        MzBrowser.platform = window.navigator.platform;

        MzBrowser.firefox = ua.indexOf("Firefox")>0;

        MzBrowser.opera = typeof(window.opera)=="object";

        MzBrowser.ie = !MzBrowser.opera && ua.indexOf("MSIE")>0;

        MzBrowser.mozilla = window.navigator.product == "Gecko";

        MzBrowser.netscape= window.navigator.vendor=="Netscape";

        MzBrowser.safari= ua.indexOf("Safari")>-1;

    if(MzBrowser.firefox) var re = /Firefox(\s|\/)(\d+(\.\d+)?)/;

    else if(MzBrowser.ie) var re = /MSIE( )(\d+(\.\d+)?)/;

    else if(MzBrowser.opera) var re = /Opera(\s|\/)(\d+(\.\d+)?)/;

    else if(MzBrowser.netscape) var re = /Netscape(\s|\/)(\d+(\.\d+)?)/;

    else if(MzBrowser.safari) var re = /Version(\/)(\d+(\.\d+)?)/;

    else if(MzBrowser.mozilla) var re = /rv(\:)(\d+(\.\d+)?)/;

    if("undefined"!=typeof(re)&&re.test(ua))

    MzBrowser.version = parseFloat(RegExp.$2);

})();

function abc()

{

    if(MzBrowser.ie)

    {

        alert('ie');

    }

    if(MzBrowser.firefox)

    {

        alert('firefox');

    }

    alert(MzBrowser.version);

}

abc();

</script>

</head>

<body>

<hr>  

<script type="text/javascript">

    var browser=navigator.appName;

    var b_version=navigator.appVersion;

    var version=parseFloat(b_version);

    document.write("Browser name: "+ browser);

    document.write("<br>");

    document.write("Browser version: "+ version);

</script>

<hr>  

<script type="text/javascript">

    document.write("Browser: ");

    document.write(navigator.appName + "");

    document.write("Browserversion: ");

    document.write(navigator.appVersion + "");

    document.write("Code: ");

    document.write(navigator.appCodeName + "");

    document.write("Platform: ");

    document.write(navigator.platform + "");

    document.write("Cookies enabled: ");

    document.write(navigator.cookieEnabled + "");

    document.write("Browser's user agent header: ");

    document.write(navigator.userAgent + "");

</script>

<hr>

<script type="text/javascript">

    var x = navigator

    document.write("CodeName=" + x.appCodeName);

    document.write("<br>");

    document.write("MinorVersion=" + x.appMinorVersion);

    document.write("<br>");

    document.write("Name=" + x.appName);

    document.write("<br>");

    document.write("Version=" + x.appVersion);

    document.write("<br>");

    document.write("CookieEnabled=" + x.cookieEnabled);

    document.write("<br>");

    document.write("CPUClass=" + x.cpuClass);

    document.write("<br>");

    document.write("OnLine=" + x.onLine);

    document.write("<br>");

    document.write("Platform=" + x.platform);

    document.write("<br>");

    document.write("UA=" + x.userAgent);

    document.write("<br>");

    document.write("BrowserLanguage=" + x.browserLanguage);

    document.write("<br>");

    document.write("SystemLanguage=" + x.systemLanguage);

    document.write("<br>");

    document.write("UserLanguage=" + x.userLanguage);

</script>

<hr>

<!---->

<script type="text/javascript">

    var browser=navigator.appName;

    var b_version=navigator.appVersion;

    var version=parseFloat(b_version);

    if ((browser=="Netscape"||browser=="Microsoft Internet Explorer") && (version>=4))

    {

        document.write("Your browser is good enough!");

    }else{

        document.write("It's time to upgrade your browser!");

    }

</script>  

//始终将divTop置于窗口的顶部

<script type="text/javascript">

<!--

window.onscroll =function(){

  var divTop = document.getElementById("divTop");

  divTop.style.top = document.body.scrollTop;

}

//-->

</script>  

//html code

<div id ="divTop" style = "position:absolute; top :0px;right:0px; color:#cccccc; width:100px;height:20px; backgrond-colot:naty;font-size:12px;">divTop</div>  

<script type="text/javascript">

//<![CDATA[

(function(w){

    alert('load start turn.');

})(window);  

//监听浏览器

var MSG_UNLOAD="确定离开？";

var UnloadConfirm = {};  

//启用监听浏览器刷新、关闭的方法

UnloadConfirm.set = function(confirm_msg){

    window.onbeforeunload = function(event){

        event = event || window.event;

        event.returnValue = confirm_msg;

    }

}  

//关闭监听浏览器刷新、关闭的方法

UnloadConfirm.clear = function(){

    window.onbeforeunload = function(){};

}

UnloadConfirm.set(MSG_UNLOAD);

//]]-->

</script>  

//只能输入数字和小数点

            function checkkey(value,e){

                var key = window.event?e.keyCode:e.which;

                if( (key > 95 && key < 106) ||

                    (key > 47 && key < 60) ||

                    (key == 110 && value.indexOf(".") < 0 )||

                    (key == 190 && value.indexOf(".") < 0 )){

                }else if(key !=8){

                    if (window.event) //IE

                    {

                        e.returnValue = false;   //event.returnValue=false

                    }

                    else //Firefox

                    {

                        e.preventDefault();

                    }

                }

            }   

/*

 * @检查复选框至少选择一项function

 * @create 11/29/2010

*/

function check_check(checkname,message,msgid,ML){

    var flag;

    var checks = document.getElementsByName(checkname);

    for(var i=0;i<checks.length;i++){

        if(checks[i].checked==true){

            flag = true;

            return true;

            break;

        }

    }

    if(!flag){

        //alert(message);

        var msgid = document.getElementById(msgid);

        var msgObj = document.createElement("div");

        msgObj.innerHTML = message;

        msgObj.style.marginLeft = ML;

        msgObj.style.color = "#f00";

        msgid.appendChild(msgObj);

        return false;

    }

}   

/**

 *iframe自适应高度代码

 *

 */

function iFrameHeight(id){

    var cwin=document.getElementById(id);

    if (document.getElementById)

    {

        if (cwin && !window.opera){

            if (cwin.contentDocument && cwin.contentDocument.body.offsetHeight){

               cwin.height = cwin.contentDocument.body.offsetHeight;

            }

            else if(cwin.Document && cwin.Document.body.scrollHeight){

               cwin.height = cwin.Document.body.scrollHeight;

            }

        }else{

            if(cwin.contentWindow.document && cwin.contentWindow.document.body.scrollHeight)

            cwin.height = cwin.contentWindow.document.body.scrollHeight;//Opera

        }

    }

}  

//Simple closure example

var list = document.getElementById('list').getElementsByTagName('li');

for (var i=0; i<list.length; i++)

{

    list[i].onclick = (function(n){

        return function (){

            var li = this.parentNode.getElementsByTagName('li');

            alert(li.length);

            alert(n);

        }

    })(i);

}  

//common javascript code write copyright

copyright=new Date();

update=copyright.getFullYear();

document.write("© " + update + " Artist Rise, All Rights Reserved.");  

//JS 控制 随滚动条移动的层

<script language="javascript">

var SP = {};  

SP.getId = function(id){

  return document.getElementById(id);

};  

SP.sCenter = function(ele) {

  var docEle = document.documentElement,

      docBody = document.body,

      Ele = SP.getId(ele),

      Top = docEle.scrollTop+docBody.scrollTop+(docEle.clientHeight-Ele.offsetHeight)/2,

      Left = docEle.scrollLeft+(docEle.clientWidth-Ele.offsetWidth)/2;

      console.log(Ele.offsetHeight+','+docEle.clientHeight);

    Ele.style.top = Top+"px";

    Ele.style.left = Left+"px";

};

SP.sLeftTop = function(ele){

  var docEle = document.documentElement,

      docBody = document.body,

      Ele = SP.getId(ele),

      Top = docEle.scrollTop+docBody.scrollTop,

      Left = docEle.scrollLeft;

    Ele.style.top = Top+"px";

    Ele.style.left = Left+"px";

};

SP.sLeftBottom = function(ele) {

  var docEle = document.documentElement,

      docBody = document.body,

      Ele = SP.getId(ele),

      Top = docEle.scrollTop+docBody.scrollTop+docEle.clientHeight-Ele.offsetHeight,

      Left = docEle.scrollLeft;

    Ele.style.top = Top+"px";

    Ele.style.left = Left+"px";

};

SP.sRightTop = function(ele){

  var docEle = document.documentElement,

      docBody = document.body,

      Ele = SP.getId(ele),

      Top = docEle.scrollTop+docBody.scrollTop,

      Left = docEle.scrollLeft+docEle.clientWidth-Ele.offsetWidth;

    Ele.style.top = Top+"px";

    Ele.style.left = Left+"px";

};

SP.sRightBottom = function(ele) {

  var docEle = document.documentElement,

      docBody = document.body,

      Ele = SP.getId(ele),

      Top = docEle.scrollTop+docBody.scrollTop+docEle.clientHeight-Ele.offsetHeight,

      Left = docEle.scrollLeft+docEle.clientWidth-Ele.offsetWidth;

    Ele.style.top = Top+"px";

    Ele.style.left = Left+"px";

};  

//init

function init(){

  SP.sCenter('redcell');

  SP.sLeftTop('redcell2');

  SP.sLeftBottom('redcell3');

};  

window.onscroll = init;

window.onresize = init;

window.onload = init;

</script>

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