document.getSelection();
Selection {anchorNode: text, anchorOffset: 4, focusNode: text, focusOffset: 4, isCollapsed: true…}
>>anchorNode:text
>>anchorOffset:0
>>baseNode:text
>>baseOffset:0
>>extentNode:text
>>extentOffset:9
>>focusNode:text
>>focusOffset:9
>>isCollapsed:false
>>rangeCount:1
>>type:"Range"
>>__proto__:Selection
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在Microsoft的Edge浏览器内,也可以使用document.getSelection(),而旧的IE10可以使用
document.selection