How does the JS loader dynamically load external js files-JS Tutorial-php.cn

How does the JS loader dynamically load external js files

高洛峰

Release： 2016-12-28 13:43:24

Original

1346 people have browsed it

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(&#39;script&#39;); 
_script.setAttribute(&#39;charset&#39;,&#39;gbk&#39;); 
_script.setAttribute(&#39;type&#39;,&#39;text/javascript&#39;); 
_script.setAttribute(&#39;src&#39;,sUrl); 
document.getElementsByTagName(&#39;head&#39;)[].appendChild(_script); 
if(MiniSite.Browser.ie){ 
_script.onreadystatechange=function(){ 
if(this.readyState==&#39;loaded&#39;||this.readyStaate==&#39;complete&#39;){ 
//fCallback();
if(fCallback!=undefined){
fCallback(); 
}
} 
}; 
}else if(MiniSite.Browser.moz){ 
_script.onload=function(){ 
//fCallback(); 
if(fCallback!=undefined){
fCallback(); 
}
}; 
}else{ 
//fCallback();
if(fCallback!=undefined){
fCallback(); 
}
} 
} 
};

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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>

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The test results are as follows:

How does the JS loader dynamically load external js files