<el-submenu :index="item.id + ''" v-for="item in menunlist" :key="item.id">
原來是elementUI的：index字段為字符串格式，后台數據為num格式，格式警告，格式轉換，問題解決！
vue報錯：Invalid prop: type check failed for prop "index". Expected String with value
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[Vue warn]: Invalid prop: type check failed for prop "index". Expected String with value "1", got Number with value 1.
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