search

Home >Web Front-end >JS Tutorial >How does the JS loader dynamically load external js files

How does the JS loader dynamically load external js files

高洛峰
高洛峰Original
2016-12-28 13:43:241348browse

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:

How does the JS loader dynamically load external js files

For more related articles on how the JS loader dynamically loads external js files, please pay attention to the PHP Chinese website!

Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：A brief analysis of modular writing of js require.jsNext article：A brief analysis of modular writing of js require.js

Related articles

See more