Detailed explanation of three usage cases of js (with code)
This time I will bring you a detailed explanation of the three usage methods of js (with code). What are the precautions for the three usage methods of js. The following is a practical case. Let’s take a look. .
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('哈哈哈哈')"> <!--onclick:点击触发一个事件，alert：弹出一个对话框--> </body> </html>
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('恭喜你中了一百万')/*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>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>
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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