Program code about the three ways of using js (inline js, internal js, external js)-JS Tutorial-php.cn

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Program code about the three ways of using js (inline js, internal js, external js)

青灯夜游

Oct 09, 2018 pm 02:32 PM

This article mainly introduces to you the example code of the three ways of using js (inline js, internal js, external js). The editor thinks it is quite good. Now I will share it with you. Interested friends can refer to it. , the details are as follows:

1. Inline js: js is not written separately

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <title>js使用方式1：行内js</title> 
</head> 
<body> 
<input type="button" value="点击有惊喜" onclick="javascript:alert(&#39;哈哈哈哈&#39;)"> 
<!--onclick:点击触发一个事件，alert：弹出一个对话框--> 
</body> 
</html>

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

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <title>js使用方式2：内部js</title> 
 <script type="text/javascript"> 
  //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> 
</head> 
<body> 
<input type="button" value="点击有惊喜" onclick="surprise()"><!--调用函数--> 
<input type="button" value="点击" onclick="surprise()"> 
</body> 
</html>

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

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <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 src="../../js/js4.js" type="text/javascript" charset="utf-8"> 
 </script> 
</head> 
<body> 
<input type="button" value="点击" onclick="test()"> 
</body> 
</html>

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Summary: The above is the js introduced to you. The example code of the three usage methods (inline js, internal js, external js), I hope it will be helpful to everyone's learning.

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