ES6 fetch方法封裝

   // 請求路徑 
　　let url = 'http://jsonplaceholder.typicode.com/users'
    // 傳輸數據參數
    const dataName = {
      name: "Sara",
      username: "高大丫",
      email: "[e-mail]"
    };
    //封裝fetch請求數據方法
    class classFetch {
      // fetchFun(請求路徑，請求方法，傳輸數據參數)
      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)