原因為：不支持當前的js版本，在perference中進行設置javascript的版本即可
注意：在perference中進行更改，而不是defeaut perference,快捷鍵操作為：command + “,”
Languages & Frameworks —> javascript —>ECMAScript 6 / React JSX
Import declarations are not supported by current JavaScript version
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let definitions are not supported by current javascript
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