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>