Compilation exception occurs after using Class

After the mini program uses the Class feature, the following exception may occur during compilation:
Uncaught SyntaxError: Unexpected token export
Uncaught SyntaxError: Unexpected token import
...... A script error occurs Or Page() is not called correctly

As shown:

Solution

Click "Project" on the left toolbar, Check "Enable ES6 to ES5"

As shown in the picture:

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