ES6 fetch方法封装

   // 请求路径 
　　let url = 'http://jsonplaceholder.typicode.com/users'
    // 传输数据参数
    const dataName = {
      name: "Sara",
      username: "高大丫",
      email: "35565451@qq.com"
    };
    //封装fetch请求数据方法
    class classFetch {
      // fetchFun(请求路径，请求方法，传输数据参数)
      fetchFun(url, meth, val) {
        return new Promise((resolve, reject) => {
          fetch(url, {
            method: meth,
            headers: {
              'Content-type': 'application/json'
            },
            body: JSON.stringify(val)
          })
            .then(response => response.json())
            .then(data => resolve(data))
            .catch(err => reject(err))
        })
      }
    }

    const fetchObj = new classFetch()
    fetchObj.fetchFun(url, 'POST', dataName)