What are the ways to introduce JavaScript?

There are three ways to introduce JavaScript: 1. Use the " " statement to introduce; 2. Write js in the script tag Code; 3. Write the js code in an external js file, and then introduce it using the src attribute of the script tag.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

There are three ways to introduce JavaScript:

1. Inline introduction:

<开始标签 on+事件类型=“js代码”>

Inline introduction methods must be combined Events are used, but internal js and external js can not be combined with events

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2. Internal introduction:

In the head or body, define the script tag, and then in Write js code in the script tag

3. External introduction:

Define external js file (file ending in .js)

The priority order of js execution is based on the order in the code.

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