如何将获取的 JSON 对象存储到全局变量中”？ [重复]

Question

我正在尝试将 'fetch' 函数获得的 JSON 对象存储到全局变量中，但是它在运行时似乎存在异步问题。

function getCustomerId(name) {
    var output;

    fetch("url" + name)
    .then(
        function(response) {
            if (response.status !== 200) {
                console.log("Looks like there was a problem. Status Code: " + response.status);
                return;
            }
            response.json().then(function(data) {
                console.log("CustomerId:" + data.id); //I have a column in my database called 'id'
                output = data.id;
            });
        }
    )

    .catch(function(err) {
        console.log("Fetch Error :-S", err);
    });

    console.log(output);
}

现在返回的响应是：

undefined
CustomerId:A1234B123C 

Answer 1

尝试使用 async/await 来实现：

async function getCustomerId(name) {
  var output;
  let response = await fetch('https://jsonplaceholder.typicode.com/todos/1');
  if (response.status !== 200) {
    console.log("Looks like there was a problem. Status Code: " + response.status);
  } else {
    const data = await response.json()
      //console.log("CustomerId:" + data.id); 
      output = data.id;
      console.log(data.id)
  }
  console.log(output);
}

getCustomerId()