页面元素选中功能

      var selection = document.getSelection()
      var range = document.createRange()
      var rangeDivDom = document.querySelector('#range-div')
      var rangeText = rangeDivDom.firstChild
      range.setStart(rangeText, position.anchorOffset)
      range.setEnd(rangeText, position.focusOffset)
      selection.removeAllRanges()
      selection.addRange(range)

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