In DOM Level 2, renaming a node was a relatively expensive operation: You had to create a new node, copy all the data to the new node, insert the new node into the tree, and delete the old one.
在DOMLevel2中，重命名一个节点的操作代价较高：必须在树中创建一个新节点，并删除老的节点。
In DOM Level 2, renaming a node was a relatively expensive operation: You had to create a new node, copy all the data to the new node, insert the new node into the tree, and delete the old one.
在DOMLevel2中，重命名一个节点的操作代价较高：必须在树中创建一个新节点，并删除老的节点。
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