一些比较实用的javascript方法收集，留着有用

2024-04-27 14:22:03

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一些比较实用的javascript方法收集，留着有用

动态加载Javascript文件

Javascript代码

<scripttype="text/javascript">
//<!--
/*动态加载方法*/
functionloadScript(url,callback){
varscript=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("Allfilesareloaded!");
});
});
});
//-->
</script>

Java代码

functionGetxmlHttPReuqest(){
varxmlhttp=null;
try
{
xmlHttp=newXMLHttpRequest();//对于Firefox Chrome等浏览器
}
catch(e)
{
try
{
xmlHttp=newActiveXObject("Msxml2.XMLHTTP");//对于IE浏览器
}
catch(e)
{
try
{
xmlHttp=newActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
xmlHttp=false;
}
}
}
returnfalse;
}

Javascript代码

//js判断浏览器
<script>
window["MzBrowser"]={};
(function(){
if(MzBrowser.platform)return;
varua=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)varre=/Firefox(/s|//)(/d+(/./d+)?)/;
elseif(MzBrowser.ie)varre=/MSIE()(/d+(/./d+)?)/;
elseif(MzBrowser.opera)varre=/Opera(/s|//)(/d+(/./d+)?)/;
elseif(MzBrowser.netscape)varre=/Netscape(/s|//)(/d+(/./d+)?)/;
elseif(MzBrowser.safari)varre=/Version(//)(/d+(/./d+)?)/;
elseif(MzBrowser.mozilla)varre=/rv(/:)(/d+(/./d+)?)/;
if("undefined"!=typeof(re)&&re.test(ua))
MzBrowser.version=parseFloat(RegExp.$2);
})();
functionabc()
{
if(MzBrowser.ie)
{
alert('ie');
}
if(MzBrowser.firefox)
{
alert('firefox');
}
alert(MzBrowser.version);
}
abc();
</script>
</head>
<body>
<hr>
<scripttype="text/javascript">
varbrowser=navigator.appName;
varb_version=navigator.appVersion;
varversion=parseFloat(b_version);
document.write("Browsername:"+browser);
document.write("<br>");
document.write("Browserversion:"+version);
</script>
<hr>
<scripttype="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("Cookiesenabled:");
document.write(navigator.cookieEnabled+"");
document.write("Browser'suseragentheader:");
document.write(navigator.userAgent+"");
</script>
<hr>
<scripttype="text/javascript">
varx=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>
<scripttype="text/javascript">
varbrowser=navigator.appName;
varb_version=navigator.appVersion;
varversion=parseFloat(b_version);
if((browser=="Netscape"||browser=="MicrosoftInternetExplorer")&&(version>=4))
{
document.write("Yourbrowserisgoodenough!");
}else{
document.write("It'stimetoupgradeyourbrowser!");
}
</script>

Code代码

//始终将divTop置于窗口的顶部
<scripttype="text/javascript">
<!--
window.onscroll=function(){
vardivTop=document.getElementById("divTop");
divTop.style.top=document.body.scrollTop;
}
//-->
</script>
//htmlcode
<divid="divTop"style="position:absolute;top:0px;right:0px;color:#cccccc;width:100px;height:20px;backgrond-colot:naty;font-size:12px;">divTop</div>

Javascript代码