window.getSelection（） 是您需要的除IE之外的所有主要浏览器< 9，它有不同的API。 window.getSelection（）返回 选择 （ spec ）您可以从中提取 DOM Range （规范）代表选择。

window.getSelection() is what you need in all major browsers except IE < 9, which has a different API. window.getSelection() returns a Selection (spec) object from which you can extract a DOM Range (spec) representing the selection.

对于IE< 9，你可以看一下 document.selection ，或使用我自己的库 Rangy ，在所有主流浏览器中提供相同的基于标准的API。

For IE < 9, you can look at document.selection, or use a library such as my own Rangy, which provides the same standards-based API in all major browsers.