小编Mar*_*iyi的帖子

我在这个问题上看到了类似的问题,但没有答案对我有用.我有一个布尔值,只要异步任务完成就会改变,但奇怪的是,ngonchages不会随时更改.以下是我的代码:

import {
    Component,
    OnChanges,
    SimpleChange
} from '@angular/core';
export class HomePage implements OnChanges {

    isLoaded: boolean;

    constructor() {
        this.isLoaded = false;
        this.loadData();
    }

    loadData() {
        setTimeout(() => {
            this.isLoaded = true;
            console.log(this.isLoaded);
        }, 3000);
    }

    ngOnChanges(changes) {
        console.log("There has been a change ", changes); //this is not firing
    }
}