Selection
常用API
selection
window.getSelection
selection.getRangeAt
selection.removeAllRanges
selection.addRange
range
document.createRange
range.getBoundingClientRect
range.selectNode
range.selectNodeContents
range.setStart
range.setEnd
设置光标
一些实践
获取range,获取选中的所有节点
获取选中项的rect
range.getBoundingClientRect()
模拟selection
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