場景：for循環省市區列表，可以取消重選
問題：取消重選省市區時有時會報錯Error in nextTick: "TypeError: Cannot read property 'key' of null"
解決辦法：在點擊取消時將之前的省/市/區列表清空，猜測可能是因為key值重復導致頁面渲染出錯
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