微信小程序实现图片上传、删除和预览功能的方法

<view class="img-v"> <view class="img" wx:for="{{imgs}}" wx:for-item="item" wx:key="*this">  <image src="{{item}}" data-index="{{index}}" mode="aspectFill" bindtap="previewImg"></image>  <view class="delete-btn" data-index="{{index}}" catchtap="deleteImg"></view> </view> <view class="upload-img-btn" bindtap="chooseImg"></view></view>

 data: {  imgs: [] },// 上传图片 chooseImg: function (e) {  var that = this;  var imgs = this.data.imgs;  if (imgs.length >= 9) {   this.setData({    lenMore: 1   });   setTimeout(function () {    that.setData({     lenMore: 0    });   }, 2500);   return false;  }  wx.chooseImage({   // count: 1, // 默认9   sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有   sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有   success: function (res) {    // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片    var tempFilePaths = res.tempFilePaths;    var imgs = that.data.imgs;    // console.log(tempFilePaths + '----');    for (var i = 0; i < tempFilePaths.length; i++) {     if (imgs.length >= 9) {      that.setData({       imgs: imgs      });      return false;     } else {      imgs.push(tempFilePaths[i]);     }    }    // console.log(imgs);    that.setData({     imgs: imgs    });   }  }); }, // 删除图片 deleteImg: function (e) {  var imgs = this.data.imgs;  var index = e.currentTarget.dataset.index;  imgs.splice(index, 1);  this.setData({   imgs: imgs  }); }, // 预览图片 previewImg: function (e) {   //获取当前图片的下标  var index = e.currentTarget.dataset.index;   //所有图片  var imgs = this.data.imgs;  wx.previewImage({   //当前显示图片   current: imgs[index],   //所有图片   urls: imgs  }) }