Range.getBoundingClientRect()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
Range.getBoundingClientRect() 返回一个 DOMRect 对象，该对象将范围中的内容包围起来；即该对象是一个将范围内所有元素的边界矩形包围起来的矩形（译者注：关于边界矩形，可以参考 Minimum Bouding Rectangles）。
此方法可用于确定文本区域中选中的部分或光标的视窗坐标。关于返回值的详细信息，参见 Element.getBoundingClientRect()。
语法
boundingRect = range.getBoundingClientRect()
示例
HTML
html
<div id="highlight"></div> <p> This example positions a "highlight" rectangle behind the contents of a range. The range's content <b>starts here</b> and continues on until it <b>ends here</b>. The bounding client rectangle contains everything selected in the range. </p> CSS
css
#highlight { background: yellow; position: absolute; z-index: -1; } p { width: 200px; } JavaScript
js
const range = document.createRange(); range.setStartBefore(document.getElementsByTagName("b").item(0), 0); range.setEndAfter(document.getElementsByTagName("b").item(1), 0); const clientRect = range.getBoundingClientRect(); const highlight = document.getElementById("highlight"); highlight.style.left = `${clientRect.x}px`; highlight.style.top = `${clientRect.y}px`; highlight.style.width = `${clientRect.width}px`; highlight.style.height = `${clientRect.height}px`; 结果
规范
| Specification |
|---|
| CSSOM View Module # dom-range-getboundingclientrect |
浏览器兼容性
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参见
Range.getClientRects()- 对于非矩形的范围（如选择部分换行了）会返回更细致的结果。Element.getBoundingClientRect()Document.caretPositionFromPoint()- 使用视窗坐标获取节点范围。