Selection.removeAllRanges()
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.
Selection.removeAllRanges() 方法会从当前 selection 对象中移除所有的 range 对象，取消所有的选择只 留下anchorNode 和focusNode属性并将其设置为 null。