JavaScript 网页选择 API

basics

window.getSelection and document.getSelection all returns the Selection object, the selection object is almost useless.

window.getSelection.getRangeAt(0) returns a Range object. for history reasons, there is only one range in each selection.

rangeAncestor = range.commonAncestorContainer; commonAncestorContainer is the common ancestor of the range elements.

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