如何将函数的返回值赋给局部变量？

Question

我需要使用类型脚本将函数的返回值分配给局部变量。下面，我已清楚解释它：

getdetail1(store){    
    let Cust_id=this.sharedata.latus_lead.m_type 
    let url="http:domain.com" 
    console.log(url); 
    let res; 
    this.loginservice.leaddata = null; 
    this.loginservice.getdetails(url).then(data=>{ 
     let lead=data; 
     this.details=lead[0]; 
     res=lead[0];       
    }); 
    return res; 
} 

并调用它像这样：

let res = this.getdetail1(store); 

看，这是我的登录服务代码

getdetails(query){ 
     if (this.leaddata) { 
     // already loaded data 
     console.log("already data loaded lead") ; 
     return Promise.resolve(this.leaddata); 
     } 
    // don't have the data yet 
    return new Promise(resolve => { 
     // We're using Angular HTTP provider to request the data, 
     // then on the response, it'll map the JSON data to a parsed JS object. 
     // Next, we process the data and resolve the promise with the new data. 
     this.http.get(query) 
     .map(res => res.json()) 
     .subscribe(data => { 
      // we've got back the raw data, now generate the core schedule data 
      // and save the data for later reference 
      this.leaddata = data; 
      resolve(this.leaddata); 
     }); 
    }); 

    } 

这里我处理答应

Answer 1

你需要返回一个承诺比从代码的变量。就像这样：

getdetail1(store){    
    let Cust_id=this.sharedata.latus_lead.m_type 
    let url="http:domain.com" 
    console.log(url); 
    let res; 
    this.loginservice.leaddata = null; 

    return this.loginservice.getdetails(url); 
} 

并调用它像这样：

this.getdetail1(store) 
    .then((data) => { 
     let res = data; 
     console.log("Your data: ",res); 
    }) 
    .catch((err) => { 
     console.log("Error occurred :", err); 
    }); 

Answer 2

你将需要做承诺链接。请参阅说明here。

尝试：

getdetail1(store){    
      let Cust_id=this.sharedata.latus_lead.m_type 
      let url="http:domain.com" 
       console.log(url); 
       this.loginservice.leaddata=null; 
       return this.loginservice.getdetails(url).then(data=>{ 
        let lead=data; 
        this.details=lead[0]; 
        return lead[0];       
      });//return the promise call as well as the data within 

和：

this.getdetail1(store).then(data=>this.res=data;)