微信小程序图片上传放大预览 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>