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html js calling method

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Release： 2023-05-15 17:45:38

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HTML and JavaScript are two highly interactive technologies with a wide range of applications. HTML is a markup language used to create web page structure and layout; JavaScript is a programming language used to create interactive effects and dynamic web pages. How to call JavaScript code in HTML? Answer below.

The method of calling JavaScript code depends on when you want the JavaScript code to start. Here are several common ways to call JavaScript code in HTML.

1. Call JavaScript code inline

A common way to call JavaScript is to call JavaScript code inline in HTML tags. Although it is a common approach, it is not recommended as it increases the size of the HTML and reduces readability.

For example:

<button onclick="myFunction()">点击我</button>

<script>
function myFunction() {
  alert("Hello World!");
}
</script>

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In the above example, when the user clicks the button, the myFunction() function in the onclick attribute will be called pop up.

2. Call JavaScript code through the header part

Another way to call JavaScript is to call JavaScript code in the HTML header part. Using this method, you store the JavaScript code in a file and reference it into the HTML document. The advantage of this method is that it can separate JavaScript code and HTML code and enhance the maintainability of the code.

For example:

<head>
<script src="myScript.js"></script>
</head>

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In the above example, myScript.js is the name of the file that stores the JavaScript code. This way you can separate your code base and easily reuse JavaScript code in HTML pages.

3. Call JavaScript code through external links

There is another way to call JavaScript code through external links. In this case, the JavaScript code is stored on a remote location and referenced through a web link.

For example:

<head>
<script src="https://www.example.com/myScript.js"></script>
</head>

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In this case, the JavaScript code is stored in a https://www.example.com/myScript.js file on an external server . This way you can easily reuse JavaScript code across multiple web pages.

Summary

There are many ways to call JavaScript code in HTML, and each method has its advantages and disadvantages. If you want to improve the readability and maintainability of your code, it is recommended to use methods in header files and external links to call JavaScript code.

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