Invalid prop: custom validator check failed for prop "index".
错误重现：
使用element-ui的菜单，在SubMenu Attribute中有一个index的属性，如果index的值从后端传入，则可能出现这个错误。
代码：
错误：
解决办法：
index的值不能有空格，并且要为字符串类型，我上面的错误就是因为jc.eid是一个int型。将其转为字符串就不会报错了。
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