动态加载js的几种方法_javascript技巧



1.直接document.write

document.write(<\/script>);

2.动态改变已有script的src属性


s1.src=test.js

3.动态创建script元素

var s2 = document.createElement(script);
s2.src=test.js
document.body.insertAdjacentElement(BeforeBegin,s2);



function loadJs(file){
var scriptTag = document.getElementById('loadScript');
var head = document.getElementsByTagName('head').item(0)
if(scriptTag) head.removeChild(scriptTag);
script = document.createElement('script');
script.src = file;
script.type = 'text/javascript';
script.id = 'loadScript';
head.appendChild(script)
}