that.setdata is not a function报错？求解决

MiniProgramError
that.setdata is not a function
TypeError: that.setdata is not a function
    at success (http://127.0.0.1:24079/appservice/pages/duanzi/duanzi.js:32:14)
    at Function.i. (http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:1794394)
    at function>
    at http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:121691
    at k (http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:600639)
    at Function. (http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:804142)
    at function>
    at http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:121691
    at http://127.0.0.1:24079/appservice/__dev__/WAService.js:2:783472
    at Set.forEach ()
————————————————————————————————
该部分js对应为：
Page({
  onLoad: function onLoad() {
    var _this2 = this;

    console.log('onLoad');
    wx.request({
      url: 'https://bb.yqchh.com/api/index.php',
      //仅为示例，并非真实的接口地址
      data: {
        a: ''
      },
      header: {
        'content-type': 'application/json' // 默认值

      },
      success: function success(res) {
        console.log(res.data);

        _this2.setData({
          a: res.data
        });
      }
    });
    var that = this;
    wx.request({
      url: 'https://bb.yqchh.com/api/index.php',
      success: function success(res) {
        that.setdata({
          a: res.data
        });
      }
    });
  }
});
wx.showShareMenu({
  withShareTicket: true,
  menus: ['shareAppMessage', 'shareTimeline'],
  success: function success(res) {
    console.log('showShareMenu', res);
  },
  onShareTimeline: function onShareTimeline() {
    var _this = this;

    return {
      title: "页面标题",
      query: "页面路径"
    };
  }
});
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});

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谢谢好心人。