///////////////////////////////////js

Page({

  data: {

    downFilelist: ["No File Select!"],

    index: 0,

    }

   onLoad: function () {

    MFile.InitWXA_FanucPMCPass()

    let that = this;

    //  console.log(`${wx.env.USER_DATA_PATH}`)

    var res = MFile.ReadDir(`${wx.env.USER_DATA_PATH}`);    

    if (res) {

      that.setData({

        downFilelist: res,

      })

    }

    console.log(that.data.downFilelist);

  },

}）

//////////////////////////////////////////////////////////////////////////////WXML

 <view class="section__title">PLC文件选择：</view>

  <picker bindchange="bindPickerChange" value="{{index}}" range="{{downFilelist}}">

    <view class="picker">

      当前选择：{{downFilelist[index]}}

    </view>

  </picker>

</view>