How does JavaScript locate elements

This article mainly explains "how to locate elements in JavaScript". Friends who are interested might as well take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "how to locate elements in JavaScript"!

The method of locating elements: 1, using getElementById ("id"); 2, using "name"; 3, using "element tag name"; 4, using "class"; 5, using "css selector".

The operating environment of this tutorial: windows10 system, javascript1.8.5 version, Dell G3 computer.

What are the methods of locating elements by JavaScript

Except that id locates to a single element element object, elements returns a list object.

1. Get it through id

Document.getElementById ("id")

two。 Get it through name

Document.getElementsByName ("Name")

List is returned

3. Select elements by signature

Document.getElementsByTagName ("tag")

4. Select elements through the CLASS class

Document.getElementsByClassName ("class")

Compatibility: browsers of IE8 and below do not implement the getElementsByClassName method

5. Select elements through the CSS selector

Document.querySelectorAll ("css selector")

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