How does the JS loader dynamically load external js files
Today I found a js loader on the Internet that can dynamically load js files. The specific code is as follows:
JsLoader.js
var MiniSite=new Object();
/**
* 判断浏览器
*/
MiniSite.Browser={
ie:/msie/.test(window.navigator.userAgent.toLowerCase()),
moz:/gecko/.test(window.navigator.userAgent.toLowerCase()),
opera:/opera/.test(window.navigator.userAgent.toLowerCase()),
safari:/safari/.test(window.navigator.userAgent.toLowerCase())
};
/**
* JsLoader对象用来加载外部的js文件
*/
MiniSite.JsLoader={
/**
* 加载外部的js文件
* @param sUrl 要加载的js的url地址
* @fCallback js加载完成之后的处理函数
*/
load:function(sUrl,fCallback){
var _script=document.createElement('script');
_script.setAttribute('charset','gbk');
_script.setAttribute('type','text/javascript');
_script.setAttribute('src',sUrl);
document.getElementsByTagName('head')[].appendChild(_script);
if(MiniSite.Browser.ie){
_script.onreadystatechange=function(){
if(this.readyState=='loaded'||this.readyStaate=='complete'){
//fCallback();
if(fCallback!=undefined){
fCallback();
}
}
};
}else if(MiniSite.Browser.moz){
_script.onload=function(){
//fCallback();
if(fCallback!=undefined){
fCallback();
}
};
}else{
//fCallback();
if(fCallback!=undefined){
fCallback();
}
}
}
};JsLoader.js test
<!DOCTYPE HTML>
<html>
<head>
<!--引入js加载器 -->
<script type="text/javascript" src="js/JsLoader.js"></script>
<title>JsLoaderTest.html</title>
<script type="text/javascript">
if(MiniSite.Browser.ie){
//动态加载Js
MiniSite.JsLoader.load("js/jquery-...js",function(){
alert("动态加载的是jquery-...js");
$(function(){
alert("jquery-...js动态加载完成之后做的处理操作");
});
});
}else{
MiniSite.JsLoader.load("js/jquery-...js",function(){
alert("动态加载的是jquery-...js");
$(function(){
alert("jquery-...js动态加载完成之后做的处理操作");
});
});
}
</script>
</head>
<body>
</body>
</html>The test results are as follows:
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