xmlhttprequest - 未捕获的 TypeError：datapoints.data.map 不是 XMLHttpRequest.xmlhttp.onreadystatechange 处的函数

Question

谁能帮我？我真的不擅长编程

错误：未捕获的类型错误：datapoints.data.map 不是 XMLHttpRequest.xmlhttp.onreadystatechange 处的函数

---

const xmlhttp = new XMLHttpRequest();
const url = '//url//';

xmlhttp.open('GET', url, true);
xmlhttp.send();

xmlhttp.onreadystatechange = function(){
  if(this.readyState == 4 && this.status == 200){
    const datapoints = JSON.parse(this.responseText);
    //console.log(datapoints);
    const labelsboy = datapoints.data.map(function(item){
      return item.boy;
    });
    console.log(labelsboy);
  }
}

---

文件 JSON API

{“状态”：真，“行”：2，“数据”：{“男孩”：10，“女孩”：15 } }

标签： xmlhttprequesttypeerror

Answer 1

map is an array function but datapoints.data is an object. It seems like you are just trying to get one value from the object so you can just access it directly.

const labelsboy = datapoints.data.boy;
console.log(labelsboy);