动态加载js的几种方法【javascript】

web前端|js教程

动态加载js

web前端-js教程

1.直接document.write

document.write();

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)

}

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