2021-11-26
意思：無法讀取未定義的屬性（正在讀取“$message”）
這個$message未定義，我是這么調用的：this.$message.error('api有誤');那么就是this指向里面沒有$message這個屬性
2021-11-26 Cannot read properties of undefined (reading '$message')
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