javascript - subscribe() 后获取返回变量的值

Question

我使用下面的代码进行异步调用，我想知道在 getData() 函数中生成的 data 的值，但是，我得到 undefined 因为调用还没有解决。有什么办法可以解决吗？

getData(address){
let url = 'https://maps.googleapis.com/maps/api/geocode/json?address='+address+'&key='+this.key;  
let call = this.http.get(url).subscribe(data =>{

  let data = data.json()
  return data;

});
}

//this is undefined because it does not know if the call was finished or not
console.log(this.latlong)

secondMethod(item){
    //this is also undefined
    this.getData(item.address)
}

Answer 1

好吧，这是您可以解决的方法，只需将数据放入数组中，然后您就可以在其他函数中检索它。

getData(address){

let array = [];

 let url = 'https://maps.googleapis.com/maps/api/geocode/json?    address='+address+'&key='+this.key;  
 let call = this.http.get(url).subscribe(data =>{

let data = data.json()
array.push(data);

});
 return array;
 }


 secondMethod(item){
//now you'll be able to retrieve it !
this.getData(item.address)
}