Question

我正在尝试在循环结束时执行函数exportList（）。但是函数执行不等待周期结束。执行函数exportList（）时，对this.ExportList数组不完整。

 async getUser() {
  let promsArr = [];
  for (let i = 0; i < this.User.length; i++) {
    let requestUri = `domain/GetPropertiesFor(accountName=@v)?@v='${this.User[i].login}'`;
    let prom = axios
      .get(requestUri, {
        headers: {
          Accept: "application/json;odata=verbose"
        }
      })
      .then(response => {
        let props = {};
        let d = response.data.d;
        let department, email = "";
        if (d.UserProfileProperties.results.length > 0) {
          for (var i = 0; i < d.UserProfileProperties.results.length; i++) {
            if (d.UserProfileProperties.results[i].Key === "Department") {
              department = d.UserProfileProperties.results[i].Value;
            }
          }
        }
        props = {
          dep: department,
          email: d.Email
        };
        promsArr.push(prom);
        this.ExportList.push(props);
      })
      .catch(error => {
        console.log(error);
      });
  }
 await Promise.all([promsArr]).then(this.exportList())
}

Answer 1

我会避免在同一函数中编写async / await和promise函数……这使您难以理解。

在这种情况下，我将其重写（未经测试）作为示例，说明了如何将promise生成（用于并行处理）与您的async / await语法分开。

async getUser() {
  const processResponse = function(response){
    let props = {};
    let d = response.data.d;
    let department, email = "";
    if (d.UserProfileProperties.results.length > 0) {
      for (var i = 0; i < d.UserProfileProperties.results.length; i++) {
        if (d.UserProfileProperties.results[i].Key === "Department") {
          department = d.UserProfileProperties.results[i].Value;
        }
      }
    }
    props = {
      dep: department,
      email: d.Email
    };

    return props;
  };
  const getAccountProps = function(login){ // this function returns a promise!
    let requestUri = `domain/GetPropertiesFor(accountName=@v)?@v='${login}'`;
    return axios
      .get(requestUri, {
        headers: {
          Accept: "application/json;odata=verbose"
        }
      })
      .then(processResponse);
  };
  try{
    let promsArr= this.User.map(u=>getAccountProps(u.login));
    let propsArr = await Promise.all(promsArr);
    this.ExportList.push(propsArr);
    await this.exportList();
  }catch(e){
    console.log('An error occurred while getting all account properties.');
  }
}

使用Promise.all在循环后执行以下功能

1 个答案: