Question

尝试在我的component.ts文件中使用.include，但它会引发以下错误。帮助我解决问题。

错误

财产＆＃39>包括＆＃39;类型＆＃39;字符串[]＆＃39;
上不存在

app.component.ts

permissionCookie: string[]; 
this.permissionCookie = cookieService.get("permissions").split(",");
this.permissionFlag = this.permissionCookie.includes("22");

ts.config

{
  "compilerOptions": {
    "baseUrl": "",
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": ["es6", "dom"],
    "mapRoot": "./",
    "module": "es6",
    "moduleResolution": "node",
    "outDir": "../dist/out-tsc",
    "sourceMap": true,
    "target": "es5",
    "typeRoots": [
      "../node_modules/@types"
    ]
  }
}

这Property 'includes' does not exist on type 'string[]'对我没有任何帮助

Answer 1

尝试将其声明为，

 private permissionCookie:Array<string>;
constructor() {
  let a = this.permissionCookie.includes("22");
  console.log(a);
}

tsconfig.json - ＆gt;

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    // "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    // "noImplicitAny": true,
    // "suppressImplicitAnyIndexErrors": true,
    "types": ["jquery"]
  },
  "exclude": [
    "node_modules/*",
    "**/*-aot.ts"
  ]
}

Answer 2

将"ES2017"添加到"lib"中的tsconfig.json数组：

{
  "compilerOptions": {
    ...
    "lib": ["dom", "es2017"],
    ...
  }
}

这应该适用于TypeScript 2.1 +。

A related issue。

.includes类型＆＃39;字符串[]＆＃39;

2 个答案: