是否有正确的方法从Angular 2(TypeScript)中的组件调用
JavaScript函数?
这是我的组件:
import { ElementRef,AfterViewInit } from '@angular/core'; export class AppComponent implements AfterViewInit { constructor(private _elementRef: ElementRef) { } ngAfterViewInit() { /** * Works but i have this error : * src/app.component.ts(68,9): error TS2304: Cannot find name 'MYTHEME'. * src/app.component.ts(69,9): error TS2304: Cannot find name 'MYTHEME'. */ MYTHEME.documentOnLoad.init(); MYTHEME.documentOnReady.init(); /** * Works without error,but doesn't seem like a right way to do it */ var s = document.createElement("script"); s.text = "MYTHEME.documentOnLoad.init(); MYTHEME.documentOnReady.init();"; this._elementRef.nativeElement.appendChild(s); } }
直接调用JavaScript函数会导致编译错误,但“已编译”的JavaScript文件(app.component.js)中的语法是正确的:
AppComponent.prototype.ngAfterViewInit = function () { MYTHEME.documentOnLoad.init(); MYTHEME.documentOnReady.init(); };
第二种方式(appendChild)工作没有错误,但我不认为(从typescript / angular更改DOM)是正确的方法.
我发现了这个:Using a Javascript Function from Typescript我尝试声明界面:
interface MYTHEME { documentOnLoad: Function; documentOnReady: Function; }
但是TypeScript似乎没有识别它(接口声明中没有错误).
谢谢
编辑:
在Juan Mendes的回答之后,这就是我的结局:
import { AfterViewInit } from '@angular/core'; interface MYTHEME { documentOnLoad: INIT; documentOnReady: INIT; } interface INIT { init: Function; } declare var MYTHEME: MYTHEME; export class AppComponent implements AfterViewInit { constructor() { } ngAfterViewInit() { MYTHEME.documentOnLoad.init(); MYTHEME.documentOnReady.init(); } }
您必须使用declare告诉TypeScript有关外部(JavaScript)声明的信息.见
https://www.typescriptlang.org/docs/handbook/writing-declaration-files.html
interface MyTheme { documentOnLoad: Function; documentOnReady: Function; } declare var MYTHEME: MyTheme;
或者匿名
declare var MYTHEME: {documentOnLoad: Function,documentOnReady: Function};