HTMLElement.offsetWidth 是一个只读属性，返回一个元素的布局宽度。一个典型的（译者注：各浏览器的offsetWidth可能有所不同）offsetWidth是测量包含元素的边框(border)、水平线上的内边距(padding)、竖直方向滚动条(scrollbar)（如果存在的话）、以及CSS设置的宽度(width)的值。
语法
var offsetWidth =element.offsetWidth;
offsetWidth 是一个只读属性。
这个属性将会 round(四舍五入)为一个整数。如果你想要一个fractional(小数)值,请使用element.getBoundingClientRect().
示例
padding-top
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padding-bottom
规范
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) View Module offsetWidth |
Working Draft |
备注
offsetWidth 是一个DHTML对象模型中的属性，由微软IE浏览器首次引入。有时候它也可以称为一个元素的物理或图形尺寸，或者<border-box>（译者注：即CSS3中的border-box模型）的宽度。
相关链接
Element.clientWidthElement.scrollWidth- Determining the dimensions of elements
- MSDN: offsetWidth Property
- MSDN: Measuring Element Dimension and Location