What are the writing positions in JavaScript?

There are three writing positions, namely: 1. Inline js, written directly into the element; 2. Inline js, written inside ""; 3. External js, written in another inside the file.

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

Three writing positions of JS

1. Inline js

Write directly into the element

<input type="button"  value="点击" onclick="alert(1)" />

2. Embedded js

Write into <script></script>

1. Embed into

Need to write an entry function

window.onload=function(){

}

2. Embed it in or

3. Write external js

in another In the file

First create a new file with the suffix .js, and then add (not allowed in the middle of the tag) in the html code write the code).

Note

1. Double quotation marks are usually used in html, and single quotation marks are usually used in js

2. When writing a large amount of js code, it is recommended to use external js

[Recommended learning: javascript advanced tutorial]

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