運行vue程序，瀏覽器報錯：
原因：檢測到重復的密鑰：'area'，因為在使用v-for循環綁定的時候，key的值是唯一的，不能相同，否則會出現意想不到的bug
解決辦法：v-for時綁定的key唯一
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