Detailed explanation of three usage methods of js

This time I will bring you a detailed explanation of the three ways to use js. What are the precautions for the three ways to use js. The following is a practical case, let’s take a look.

1. Inline js: js is not written separately

nbsp;html> 
 
 
 <meta> 
 <title>js使用方式1：行内js</title> 
 
 
<input> 
<!--onclick:点击触发一个事件，alert：弹出一个对话框--> 
 

2. Internal js: the program in script can be used on the entire page

nbsp;html> 
 
 
 <meta> 
 <title>js使用方式2：内部js</title> 
 <script> 
  //声明一个函数(整个文档都可以使用) 
  function surprise() { 
   alert(&#39;恭喜你中了一百万&#39;)/*弹出框*/ 
  } 
 </script> 
 
 
<input><!--调用函数--> 
<input> 
 

3. External js: Many html pages can call the set js page

nbsp;html> 
 
 
 <meta> 
 <title>js使用方式3：外部js</title> 
 <!--很多html页面都可以调用js4.js页面--> 
 <script> 
 </script> 
 
 
<input> 
 

I believe you have mastered the method after reading the case in this article. Please come for more exciting information. Pay attention to other related articles on php Chinese website!

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