同一个照片可以选择两次？

选择的时候，没办法，只有选择之后，你自己在代码中处理

是不是赋值问题，data里，给一个
data: {
    picList: [],
  },
 // 拍照，你可以选择相册
  chooseimage: function () {//选择图片
    var self = this;
    wx.chooseMedia({
      count: 1,
      mediaType: ['image'],
      sourceType: ['camera'],
      camera: 'back',
      success: function (res) {
        self.uploadImage(res.tempFiles[0].tempFilePath, 0, self);
      }
    })
  },
 uploadImage: function (uploadingImage, i, self)//上传照片
  {
    var images = self.data.picList;
    var uploadImgPath = uploadingImage;
    var imgObj = new Object();
    imgObj.filePath = "/images/icon_uploading.png";
    images.push(imgObj);
    self.setData({
      picList: images
    });
    //上传照片
    wx.uploadFile({
      url: 自己的请求路径,
      filePath: uploadImgPath,
      name: "file",
      header: {
        "Content-Type": "multipart/form-data"
      },
      success: function (res) {
        var resImg = res.data;
        var imgObj = images[images.length - 1];
        imgObj.filePath = uploadImgPath;
        imgObj.imgUrl = resImg;
        self.setData({
          picList: images
        });
        console.log("image=" + images[0].imgUrl);
        console.log("picList长度:" + images.length);


      }
    })
  },

<view class="picList">
          <view wx:for="{{picList}}" wx:key='index' wx:for-index="idx" data-idx="{{idx}}" class="picView">
            <image class="pic" mode="aspectFill" src="{{item.filePath}}"></image>
          </view>
        </view>