Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The node before which the new nod

insertBefore插入節點出錯 Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node 插入的節點不是插入在,子節點以前! insertBefore()
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