typescript 类型“string[]”上不存在属性“includes”
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Property 'includes' does not exist on type 'string[]'
提问by ZeeAzmat
Getting the error
得到错误
Property 'includes' does not exist on type 'string[]'
类型“string[]”上不存在属性“includes”
in node_modules/ng2-breadcrumb/app/components/breadcrumbService.ts I am trying to implement breadcrumb functionality in an angular2 app.
在 node_modules/ng2-breadcrumb/app/components/breadcrumbService.ts 我试图在 angular2 应用程序中实现面包屑功能。
回答by mrkvon
Add "ES2017"to your "lib"array in tsconfig.json:
添加"ES2017"到您的"lib"数组中tsconfig.json：
{
"compilerOptions": {
...
"lib": ["es6", "dom", "es2017"],
...
"target": "es5",
...
}
}
This should work since TypeScript 2.1.
这应该从 TypeScript 2.1 开始工作。
一个相关的问题。
Explanation
解释
The includesmethod on Arrayis supported since ES7 (ES2016). The above will add a missing library file to compilation.
的includes上方法Array自ES7（ES2016）被支撑。以上将添加一个缺少的库文件进行编译。
The TypeScript compiler options are documented here.
Lib es2016or es7may be sufficient instead of es2017(not tested).
Libes2016或es7可能足以代替es2017（未测试）。
回答by ovabrandon
If you don't want to change to es2016, just use arr.indexOf(valueToCheck) !== -1.
如果你不想改成 es2016，直接用arr.indexOf(valueToCheck) !== -1.
回答by BlackGlory
Changing the compiler target to "es2016" in tsconfig.jsshould solve this issue.
将编译器目标更改为“es2016”tsconfig.js应该可以解决这个问题。
