進入組件頁面時，vue報錯：Error in mounted hook: "TypeError: handler.call is not a function"，
造成報錯原因就是生命周期鈎子函數mounted: {}是否有聲明了未定義方法或是只聲名了鈎子函數。
處理方法：1.把mounted: {}刪除掉，
2.把mounted: {}改為mounted(){},
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