一些比较适用的javascript方法
日期：2014-05-16 浏览次数：20446 次
一些比较实用的javascript方法
动态加载javascript文件
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>
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