There are several ways to add javascript to a web page

There are two ways to add js to a web page, namely: 1. Direct method, the syntax format is "<script>js code</script>"; 2. Reference method, the syntax format is "< script src="js address" type="text/javascript">".

1. Direct method

This is the most commonly used method. Most web pages containing Javascript use this method, such as:

<script type="application/javascript">
　　<!--
　　document.write("这是Javascript！采用直接插入的方法！");
　　//-Javascript结束-->
　　</script>

In this example, we can see a new tag: <script>...</script>, and

There is also a more advanced version of the embedded script, which uses the CDATA syntax in HTML (Character Data, which treats all the text in CDATA as plain text, unless it encounters the end of CDATA)

<script language="javascript" type="text/javascript"><!--//--><!CDATA[[//><!--
　　//javascript代码
　　//--><!]]></script>

2. Reference method

If there is already a Javascript source file (usually with js extension), you can use this reference method to improve the utilization of the program code. The basic format is as follows:

<script src=“url” type="text/javascript"></script>

The Url is the address of the program file. Likewise, such statements can be placed in the head or any part of the body of an HTML document. If you want to achieve the effect of the example in the "Direct Insertion Method", you can first create a Javascript source code file "Script.js" with the following content:

document.write("这是Javascript！采用直接插入的方法！");

In the web page, you can call the program like this: < script src="Script.js" type="text/javascript"> .

You can also specify the javascript version when importing the file, for example:

Note: Any content in the script tag that specifies the src attribute will be ignored.

[Recommended learning: javascript advanced tutorial]

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