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>