仅当 “module“ 选项设置为 “esnext“ 或 “system“，并且 “target“ 选项设置为 “es2017“ 或更高版本时，才允许使用顶级 “await“ 表达式。ts(1378)

仅当 “module” 选项设置为 “esnext” 或 “system”，并且 “target” 选项设置为 “es2017” 或更高版本时，才允许使用顶级 “await” 表达式。ts(1378)

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    "charset": "utf8",
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    "experimentalDecorators": true,
    "inlineSourceMap": true,
    "module": "esnext", // 修改 commonjs -- esnext
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    "target": "ES2018"
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