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据目前的实现,假设前置节点和后置节点都处理完,各只剩一个节点,分别是一个新增节点和一个删除节点,那么此时新增的节点不会被挂载。
将 moved 判断移入循环中使得 source 数组中 -1 的元素得以挂载。