// 函数

fetch() {

    return new Promise((resolve, reject) => {

     Utils.sendAjax({

      url: 'xxx.html',

      type: 'json',

      callback: function (result) {

        if (result.code == '200') {

          resolve(result.data) // 将返回的data传递给下一个promise

        } else {

          reject()

          Message.warning(result.message)

        }

      }

    })

   })

  }

  fetch1(value) {

    return new Promise((resolve, reject) => {

     Utils.sendAjax({

      url: 'xxx.html',

      type: 'json',

      callback: (result) => {

        if (result.code == '200') {

          let data= Object.assign({}, result.data, value)

          this.setState({

            data: data

          })

        } else {

          reject()

          Message.warning(result.message)

        }

      }

    })

   })

  }

//  调用

fetch()

   .then((value) => {

      fetch1(value)

   })