微信小程序实现图片上传放大预览删除代码

Page({ //选择相册或拍照 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 that = this;  var imgs = that.data.imgs;  var index = e.currentTarget.dataset.index;//获取当前长按图片下标  wx.showModal({   title: '提示',   content: '确定要删除此图片吗？',   success: function (res) {    if (res.confirm) {     console.log('点击确定了');     imgs.splice(index, 1);    } else if (res.cancel) {     console.log('点击取消了');     return false;    }    that.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   })  }})

<button class="upload-img-btn" bindtap="chooseImg">上传</button> <view class="img" wx:for="{{imgs}}" wx:for-item="item" wx:key="*this">  <image src="{{item}}" data-index="{{index}}" mode="widthFix" bindtap="previewImg" bindlongpress="deleteImg"></image> </view>