场景：for循环省市区列表，可以取消重选
问题：取消重选省市区时有时会报错Error in nextTick: "TypeError: Cannot read property 'key' of null"
解决办法：在点击取消时将之前的省/市/区列表清空，猜测可能是因为key值重复导致页面渲染出错
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