在Ionic3和angular4中使用Async和Await

Question

we never used await/async, so the question could be also a stupid one but what do we wrong?

This is our code:

  constructor() {
       let text = this.textAsync();
       console.log('text: ', text);
  }


  async textAsync() {
    let val = await this._text(); 
    return val;
  }

  _text(): Promise<any> {
    return new Promise((resolve, reject) => {
           resolve('TEEEEXXTTTTT');
    })
  }

The log is never text: TEEEEXXTTTTT but something like that

text: ZoneAwarePromise {__zone_symbol__state: null, __zone_symbol__value: Array[0]}

I'm sure there is a simple solution :smile:

thx

Answer 1

this.textAsync(); returns a promise, so you have to wait until it's resolved:

  constructor() {
       this.textAsync()
       .then((text)=> { console.log('text: ', text) });
  }