How to introduce js files into html

Two import methods: 1. Use the src attribute of the script tag to import the js file, the syntax is "". 2. Reference js files in JavaScript code with the syntax "script tag object.src = "file path";".

The operating environment of this tutorial: windows7 system, javascript1.8.5&&HTML5 version, Dell G3 computer.

js file refers to a text file that stores JavaScript code, with the suffix name ".js".

So how to introduce js files in html, there are the following two methods:

The first one: use the src attribute of the script tag to introduce js files

<script type="text/javascript" src="../js/jquery-1.8.3.js"></script>//（相对路径）
<script src="http://common.cnblogs.com/script/jquery.js" type="text/javascript"></script>//（绝对路径）

Second type:Referencing external js in JavaScript code

<script>
　　window.onload = function(){
　　　　var script = document.createElement("script");
　　　　script.setAttribute("type","text/javascript");
　　　　script.src = "http://common.cnblogs.com/script/jquery.js";
　　　　document.getElementsByTagName("head")[0].appendChild(script);  
　　}
</script>

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