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JavaScript runtime error: Unable to get property createRange ...

createTextRange ) {. var r = document.selection.createRange().duplicate(). r.moveEnd( 'character' , o.value.length). if (r.text == '' ) return o.value.length.

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查詢 「createTextRange」的人也找了：

  1. createTextRange
    2.
  2. createTextRange is not a function
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  3. execCommand
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  4. Document body createTextRange
    5.
  5. createContextualFragment
    6.
  6. createRange
    7.
  7. getSelection
    8.
  8. setSelectionRange
    9.