进入组件页面时，vue报错：Error in mounted hook: "TypeError: handler.call is not a function"，
造成报错原因就是生命周期钩子函数mounted: {}是否有声明了未定义方法或是只声名了钩子函数。
处理方法：1.把mounted: {}删除掉，
2.把mounted: {}改为mounted(){},
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