typescript 在模块内部调用全局变量
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Call a global variable inside module
提问by user1027303
I have a typescript file called Projects.tsthat I want to reference a global variable declared in a bootstrap plugin called bootbox.js.
我有一个名为的打字稿文件Projects.ts，我想引用在名为bootbox.js.
I want to access a variable called bootboxfrom within a TypeScript classes.
我想访问bootbox从 TypeScript 类中调用的变量。
Is it possible?
是否可以？
回答by Fenton
You need to tell the compiler it has been declared:
您需要告诉编译器它已被声明：
declare var bootbox: any;
If you have better type information you can add that too, in place of any.
如果你有更好的类型信息，你也可以添加它，代替any.
回答by Himanshu Arora
For those who didn't know already, you would have to put the declarestatement outside your classjust like this:
对于那些还不知道的人，您必须像这样将declare语句放在您的外面class：
declare var Chart: any;
@Component({
selector: 'my-component',
templateUrl: './my-component.component.html',
styleUrls: ['./my-component.component.scss']
})
export class MyComponent {
//you can use Chart now and compiler wont complain
private color = Chart.color;
}
In TypeScriptthe declare keyword is used where you want to define a variable that may not have originated from a TypeScriptfile.
在TypeScript你想要定义一个可能不是来自TypeScript文件的变量的地方使用 declare 关键字。
It is like you tell the compiler that, I know this variable will have a value at runtime, so don't throw a compilation error.
就像你告诉编译器一样，我知道这个变量在运行时会有一个值，所以不要抛出编译错误。
回答by Josh Wulf
If it is something that you reference but never mutate, then use const:
如果它是您引用但从不变异的东西，则使用const：
declare const bootbox;
回答by Prusdrum
Sohnee solutions is cleaner, but you can also try
Sohnee 解决方案更干净，但您也可以尝试
window["bootbox"]
回答by Krzysztof Grzybek
If You want to have a reference to this variable across the whole project, create somewhere d.tsfile, e.g. globals.d.ts. Fill it with your global variables declarations, e.g.:
如果您想在整个项目中引用此变量，请创建某个d.ts文件，例如globals.d.ts. 用您的全局变量声明填充它，例如：
declare const BootBox: 'boot' | 'box';
Now you can reference it anywhere across the project, just like that:
现在你可以在整个项目的任何地方引用它，就像这样：
const bootbox = BootBox;
Here's an example.
这是一个例子。
回答by ser savv
Download the bootbox typings
下载引导箱类型
Then add a reference to it inside your .ts file.
然后在 .ts 文件中添加对它的引用。
