CSSStyleDeclaration.length - Web APIs 编辑

The read-only property returns an integer that represents the number of style declarations in this CSS declaration block.

Syntax

var num = styles.length;

An integer that provides the number of styles explictly set on the parent of the instance.

The following gets the number of explicitly set styles on the following HTML element:

<div id="div1" style="margin: 0 10px; background-color: #CA1; font-family: monospace"></div>

JavaScript code:

var myDiv = document.getElementById('div1'); var divStyle = myDiv.style; var len = divStyle.length; // 6

Specification	Status	Comment
CSS Object Model (CSSOM) The definition of 'CSSStyleDeclaration.length' in that specification.	Working Draft
Document Object Model (DOM) Level 2 Style Specification The definition of 'CSSStyleDeclaration' in that specification.	Obsolete