使用字符串类型参数访问枚举时出现 TypeScript TS7015 错误

我是TypeScript新手，我不明白需要做什么来修复生成TS7015错误的行(使用字符串变量引用枚举成员)，因为紧跟其后的行不会出错(使用字符串文字引用枚举成员):

enum State {
    Happy = 0,
    Sad = 1,
    Drunk = 2
}

function Emote(enumKey:string) {
    console.log(State[enumKey]); // error TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'.
    console.log(State["Happy"]); // no error
}

如果检测到错误，则在项目的tsconfig.json中设置"noImplicitAny": true

"noImplictAny": false设置在项目的tsconfig.json中，未检测到任何错误

我用"ntypescript": "^1.201603060104.1"来编译

我现在用"tsc": "1.8.10"美元来编译

C:>npm install -g typescript

`-- typescript@1.8.10

验证安装:

C:\>tsc --version

Version 1.8.10

这是我的tsconfig.json份文件:

{
  "compileOnSave": true,
  "compilerOptions": {
    "target": "ES5",
    "module": "System",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": true,
    "noImplicitAny": true,
    "sourceMap": true,
    "mapRoot": "map/",
    "diagnostics": true
  },
  "exclude": [
    "node_modules",
    "typings"
  ]
}

以下是编译器输出:

C:\>tsc

test.ts(8,17): error TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'.