<el-submenu :index="item.id + ''" v-for="item in menunlist" :key="item.id">
原来是elementUI的：index字段为字符串格式，后台数据为num格式，格式警告，格式转换，问题解决！
vue报错：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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