HTMLElement.offsetLeft

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HTMLElement.offsetLeft read-only property returns the number of pixels that the upper left corner of the current element is offset to the left within the HTMLElement.offsetParent 节点。

For block-level elements, offsetTop , offsetLeft , offsetWidth ，和 offsetHeight describe the border box of an element relative to the offsetParent .

However, for inline-level elements (such as span ) that can wrap from one line to the next, offsetTop and offsetLeft describe the positions of the 第一 border box (use Element.getClientRects() to get its width and height), while offsetWidth and offsetHeight describe the dimensions of the bounding border box (use Element.getBoundingClientRect() to get its position). Therefore, a box with the left, top, width and height of offsetLeft , offsetTop , offsetWidth and offsetHeight will not be a bounding box for a span with wrapped text.

句法

left = element.offsetLeft;

left is an integer representing the offset to the left in pixels from the closest relatively positioned parent element.

范例

var colorTable = document.getElementById("t1");
var tOLeft = colorTable.offsetLeft;
if (tOLeft > 5) {
  // large left offset: do something here
}

This example shows a 'long' sentence that wraps within a div with a blue border, and a red box that one might think should describe the boundaries of the span.

Image:offsetLeft.jpg

<div style="width: 300px; border-color:blue; border-style:solid; border-width:1;">
  <span>Short span. </span>
  <span id="longspan">Long span that wraps within this div.</span>
</div>
<div id="box" style="position: absolute; border-color: red; border-width: 1; border-style: solid; z-index: 10">
</div>
<script type="text/javascript">
  var box = document.getElementById("box");
  var longspan = document.getElementById("longspan");
  box.style.left = longspan.offsetLeft + document.body.scrollLeft + "px";
  box.style.top = longspan.offsetTop + document.body.scrollTop + "px";
  box.style.width = longspan.offsetWidth + "px";
  box.style.height = longspan.offsetHeight + "px";
</script>

规范

规范	状态	注释
CSSOM (CSS 对象模型) 视图模块 The definition of 'offsetLeft' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`offsetLeft`	Chrome 1	Edge 12	Firefox 1	IE 8	Opera 8	Safari 3	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 10.1	Safari iOS 1	Samsung Internet Android 1.0

图例

完整支持

另请参阅

HTMLElement.offsetParent , HTMLElement.offsetTop , HTMLElement.offsetWidth , HTMLElement.offsetHeight

元数据

最后修改： May 8, 2020

在此页

句法

范例

规范

浏览器兼容性

图例

另请参阅

相关话题