效果圖

資料：

依賴介面wx.upload、chooseImage與preview 資料請求通過LeanCloud完成

圖片選擇：

前端處理：

1.儲存images陣列為已選擇圖片 2.選擇了更多圖片後concat陣列 3.預覽圖集 4.leancloud上傳多圖，目測順序一致

js程式碼

const AV = require('../../../utils/av-weapp.js')
var that;
Page({
    data: {
        images: [],
        uploadedImages: [],
        imageWidth: getApp().screenWidth / 4
 
 - 10
    },
    onLoad: function (options) {
        that = this;
        var objectId = options.objectId;
        console.log(objectId);
    },
    chooseImage: function () {
        // 選擇圖片
        wx.chooseImage({
            sizeType: ['compressed'], 
            sourceType: ['album', 'camera'], // 可以指定來源是相簿還是相機，預設二者都有
 

            success: function (res) {
                // 返回選定照片的本地檔案路徑列表，tempFilePath可以作為img標籤的src屬性顯示圖片
                var tempFilePaths = res.tempFilePaths;
                console.log(tempFilePaths);
                that.setData({
                    images: that.data.images.concat(tempFilePaths)
                });
            }
        })
    },
    previewImage: function
 
 () {
        // 預覽圖集
        wx.previewImage({
            urls: that.data.images
        });
    },
    submit: function () {
        // 提交圖片，事先遍歷圖集陣列
        that.data.images.forEach(function (tempFilePath) {
            new AV.File('file-name', {
                blob: {
                    uri: tempFilePath,
                },
            }).save().then(
                // file => console.log(file.url())
                function(file) {
                    // 先讀取
                    var uploadedImages = that.data.uploadedImages;
                    uploadedImages.push(file.url());
                    // 再寫入
                    that.setData({
                        uploadedImages: uploadedImages
                    });
                    console.log(uploadedImages);
                }
            ).catch(console.error);
        });
        wx.showToast({
            title: '評價成功',
            success: function () {
                wx.navigateBack();
            }
        });
    },
    delete: function (e) {
        var index = e.currentTarget.dataset.index;
        var images = that.data.images;
        images.splice(index, 1);
        that.setData({
            images: images
        });
    }
})

wxml程式碼

<viewclass="gallery"><viewclass="item"wx:for="{{images}}"wx:key=""><imagestyle="width: {{imageWidth}}px; height: {{imageWidth}}px"src=" {{item}}"bindtap="previewImage"mode="aspectFill" /><!-- 刪除按鈕 --><viewclass="delete"bindtap="delete"data-index="{{index}}"><imagestyle="left: {{imageWidth / 2 - 10}}px;"src="/images/icon_delete.png" /></view></view><viewclass="item"><imagestyle="width: {{imageWidth}}px; height: {{imageWidth}}px"src="/images/icon_add.png"class="button-upload"bindtap="chooseImage" /></view></view><buttontype="primary"bindtap="submit">提交</button>

wxss程式碼

/*畫廊*/
.gallery {
    /*margin-bottom: 100rpx;*/
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
}

/*每張圖片所佔容器*/
.item {
    position: relative;
    margin: 5px;
}

/*刪除按鈕*/
.delete {
    position: absolute;
    height: 20px;
    bottom: 0;
    width: 100%;
    background: #ccc;
    opacity: .8;
}

.delete image {
    position: absolute;
    width: 20px;
    height: 20px;
}