typescript `(this as any)` 在这个打字稿片段中是什么意思？
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what does `(this as any)` mean in this typescript snippet?
提问by madjardi
I meet this code and do not understand exactly what it does :
我遇到了这段代码，但并不完全理解它的作用：
public uploadItem(value:FileItem):void {
let index = this.getIndexOfItem(value);
let item = this.queue[index];
let transport = this.options.isHTML5 ? '_xhrTransport' : '_iframeTransport';
item._prepareToUploading();
if (this.isUploading) {
return;
}
this.isUploading = true;
(this as any)[transport](item);
}
Can anyone explain what does this (this as any)statement do?
任何人都可以解释这个 （this as any）语句的作用是什么？
采纳答案by Mouneer
(this as any )is just a Type Assertionthat works on dev/compiling time and has no side effects on run time because it is purely a Typescript thing. It can be useful if something related to thislike this[whatever]which outputs a TS error because whateveris not defined inside the thisTS type. So, this error can be suppressed with (this as any)[whatever]
(this as any )只是一个类型断言，它适用于开发/编译时并且对运行时没有副作用，因为它纯粹是一个 Typescript 的东西。它可以是有用的，如果相关的东西this喜欢this[whatever]，因为其输出TS错误whatever未在内部限定thisTS类型。所以，这个错误可以被抑制(this as any)[whatever]
Also(this as any)is the equivalent to (<any> this)
也(this as any)相当于(<any> this)
Note to mention:--suppressImplicitAnyIndexErrorsas a compiler optionsuppresses those kind of possible errors.
请注意：--suppressImplicitAnyIndexErrors作为编译器选项可以抑制那些可能的错误。
回答by arunprakashpj
It can be actually written as
其实可以写成
(<any>this)[transport](item);
The type casting is exhibited in the above statement!
上面的语句中展示了类型转换！
