微信小程序打开地图选择位置

页面设置一个button按钮，点击触发（showMap）函数，调用api

 showMap() {
    wx.chooseLocation({
      success: (res) => {
        let {
          address
        } = res;
        this.setData({
          bigAddress: address
        })
      }
    })
  },