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node.replaceChild(newnode,oldnode)

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newnode Node object ±ØÐè¡£ÄúÏ£Íû²åÈëµÄ½Úµã¶ÔÏó¡£
oldnode Node object ±ØÐè¡£ÄúÏ£Íûɾ³ýµÄ½Úµã¶ÔÏó¡£

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