基于weui上传组件的二次封装

　　公司千万级用户应用继续上新功能了，这次新功能主要迭代是小程序，让小程序支持发布商品功能，这是封装weui上传组件的原因，又是因为工作才去做的事情，我真是个不主动学习的人，先自责一下；这次记录主要是考虑到其中的实现有很多小程序开发的细节，实现方案比较low，但是还是记一下这个上传图片+视频的组件，其它文件上传也是同理。

先来看看weui的上传组件

　　

　　从UI的角度来看，明显是用flex布局，view元素来实现整体布局。

我们的需求是:

1. 长按后可拖拽换文件位置
2. 如果是图片，需要先压缩尺寸，再压缩质量，直到压缩尺寸小于500kb，视频尺寸小于5mb
3. 图片视频上传到云服务器，成功后渲染
4. 图片，视频数量限制 n + m

总结组件的主要功能需要做到：

1. 文件大小限制
2. 压缩图片
3. 上传图片视频
4. 可拖拽
   

具体实现

1. wxml文件，直接拷贝weui，然后写一些自定义样式

/*!
 * WeUI v2.3.0 (https://github.com/weui/weui-wxss)
 * Copyright 2020 Tencent, Inc.
 * Licensed under the MIT license
 */
[data-weui-theme=light],
page {
    --weui-BG-0: #ededed;
    --weui-BG-1: #f7f7f7;
    --weui-BG-2: #fff;
    --weui-BG-3: #f7f7f7;
    --weui-BG-4: #4c4c4c;
    --weui-BG-5: #fff;
    --weui-FG-0: rgba(0, 0, 0, .9);
    --weui-FG-HALF: rgba(0, 0, 0, .9);
    --weui-FG-1: rgba(0, 0, 0, .5);
    --weui-FG-2: rgba(0, 0, 0, .3);
    --weui-FG-3: rgba(0, 0, 0, .1);
    --weui-RED: #fa5151;
    --weui-ORANGE: #fa9d3b;
    --weui-YELLOW: #ffc300;
    --weui-GREEN: #91d300;
    --weui-LIGHTGREEN: #95ec69;
    --weui-BRAND: #07c160;
    --weui-BLUE: #10aeff;
    --weui-INDIGO: #1485ee;
    --weui-PURPLE: #6467f0;
    --weui-WHITE: #fff;
    --weui-LINK: #576b95;
    --weui-TEXTGREEN: #06ae56;
    --weui-FG: #000;
    --weui-BG: #fff;
    --weui-TAG-TEXT-ORANGE: #fa9d3b;
    --weui-TAG-BACKGROUND-ORANGE: rgba(250, 157, 59, .1);
    --weui-TAG-TEXT-GREEN: #06ae56;
    --weui-TAG-BACKGROUND-GREEN: rgba(6, 174, 86, .1);
    --weui-TAG-TEXT-BLUE: #10aeff;
    --weui-TAG-BACKGROUND-BLUE: rgba(16, 174, 255, .1);
    --weui-TAG-TEXT-BLACK: rgba(0, 0, 0, .5);
    --weui-TAG-BACKGROUND-BLACK: rgba(0, 0, 0, .05)
}

[data-weui-theme=dark] {
    --weui-BG-0: #191919;
    --weui-BG-1: #1f1f1f;
    --weui-BG-2: #232323;
    --weui-BG-3: #2f2f2f;
    --weui-BG-4: #606060;
    --weui-BG-5: #2c2c2c;
    --weui-FG-0: hsla(0, 0%, 100%, .8);
    --weui-FG-HALF: hsla(0, 0%, 100%, .6);
    --weui-FG-1: hsla(0, 0%, 100%, .5);
    --weui-FG-2: hsla(0, 0%, 100%, .3);
    --weui-FG-3: hsla(0, 0%, 100%, .05);
    --weui-RED: #fa5151;
    --weui-ORANGE: #c87d2f;
    --weui-YELLOW: #cc9c00;
    --weui-GREEN: #74a800;
    --weui-LIGHTGREEN: #28b561;
    --weui-BRAND: #07c160;
    --weui-BLUE: #10aeff;
    --weui-INDIGO: #1196ff;
    --weui-PURPLE: #8183ff;
    --weui-WHITE: hsla(0, 0%, 100%, .8);
    --weui-LINK: #7d90a9;
    --weui-TEXTGREEN: #259c5c;
    --weui-FG: #fff;
    --weui-BG: #000;
    --weui-TAG-TEXT-ORANGE: rgba(250, 157, 59, .6);
    --weui-TAG-BACKGROUND-ORANGE: rgba(250, 157, 59, .1);
    --weui-TAG-TEXT-GREEN: rgba(6, 174, 86, .6);
    --weui-TAG-BACKGROUND-GREEN: rgba(6, 174, 86, .1);
    --weui-TAG-TEXT-BLUE: rgba(16, 174, 255, .6);
    --weui-TAG-BACKGROUND-BLUE: rgba(16, 174, 255, .1);
    --weui-TAG-TEXT-BLACK: hsla(0, 0%, 100%, .5);
    --weui-TAG-BACKGROUND-BLACK: hsla(0, 0%, 100%, .05)
}

[data-weui-theme=light],
page {
    --weui-BG-COLOR-ACTIVE: #ececec
}

[data-weui-theme=dark] {
    --weui-BG-COLOR-ACTIVE: #373737
}

[data-weui-theme=light],
page {
    --weui-BTN-DISABLED-FONT-COLOR: rgba(0, 0, 0, .2)
}

[data-weui-theme=dark] {
    --weui-BTN-DISABLED-FONT-COLOR: hsla(0, 0%, 100%, .2)
}

[data-weui-theme=light],
page {
    --weui-BTN-DEFAULT-BG: #f2f2f2
}

[data-weui-theme=dark] {
    --weui-BTN-DEFAULT-BG: hsla(0, 0%, 100%, .08)
}

[data-weui-theme=light],
page {
    --weui-BTN-DEFAULT-COLOR: #06ae56
}

[data-weui-theme=dark] {
    --weui-BTN-DEFAULT-COLOR: hsla(0, 0%, 100%, .8)
}

[data-weui-theme=light],
page {
    --weui-BTN-DEFAULT-ACTIVE-BG: #e6e6e6
}

[data-weui-theme=dark] {
    --weui-BTN-DEFAULT-ACTIVE-BG: hsla(0, 0%, 100%, .126)
}

[data-weui-theme=light],
page {
    --weui-DIALOG-LINE-COLOR: rgba(0, 0, 0, .1)
}

[data-weui-theme=dark] {
    --weui-DIALOG-LINE-COLOR: hsla(0, 0%, 100%, .1)
}

.weui-uploader {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1
}

.weui-uploader__hd {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    padding-bottom: 16px;
    -webkit-box-align: center;
    -webkit-align-items: center;
    align-items: center
}

.weui-uploader__title {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1
}

.weui-uploader__info {
    color: var(--weui-FG-2)
}

.weui-uploader__bd {
    margin-bottom: -8px;
    margin-right: -8px;
    overflow: hidden
}

.weui-uploader__files {
    list-style: none
}

.weui-uploader__file {
    float: left;
    background: no-repeat 50%;
    background-size: cover;
    position: relative;
}

.weui-uploader__file_status {
    position: relative
}

.weui-uploader__file_status:before {
    content: " ";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgba(0, 0, 0, .5)
}

.weui-uploader__file_status .weui-uploader__file-content {
    display: block
}

.weui-uploader__file-content {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    color: var(--weui-WHITE)
}

.weui-uploader__file-content .weui-icon-warn {
    display: inline-block
}

.weui-uploader__input-box {
    float: left;
    position: relative;
    margin-right: 8px;
    margin-bottom: 8px;
    box-sizing: border-box;
    background-color: #ededed
}

[data-weui-theme=dark] .weui-uploader__input-box {
    background-color: #2e2e2e
}

.weui-uploader__input-box:after,
.weui-uploader__input-box:before {
    content: " ";
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    background-color: #a3a3a3
}

[data-weui-theme=dark] .weui-uploader__input-box:after,
[data-weui-theme=dark] .weui-uploader__input-box:before {
    background-color: #6d6d6d
}

.weui-uploader__input-box:before {
    width: 2px;
    height: 32px
}

.weui-uploader__input-box:after {
    width: 32px;
    height: 2px
}

.weui-uploader__input-box:active:after,
.weui-uploader__input-box:active:before {
    opacity: .7
}

.weui-uploader__input {
    position: absolute;
    z-index: 1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0)
}

.weui-uploader__img {
    display: block;
    width: 100%;
    height: 100%;
}

.uploader-img-delete {
    position: absolute;
    right: 0px;
    top: 0px;
    width: 18px;
    height: 18px;
}

.play-icon {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
}

2.WXS文件，主要计算坐标

function getRowsNum(files，maxNumPerRow) {
    if (!files) return 1;
    return parseInt(files.length/maxNumPerRow) + 1;
}

function getAddedImgPos(index, maxNumPerRow, imageWidth) {
    var x = 0, y = 0;
    var quotient = parseInt((index)/maxNumPerRow);
    var remainder = (index + 1)%maxNumPerRow;
    if (remainder === 0) {
        x = (maxNumPerRow - 1) * imageWidth;
    } else {
        x = (remainder - 1) * imageWidth;
    }

    y = quotient * imageWidth;

    var pos = {
        x: x,
        y: y,
    };

    return pos;
}

3.js文件

export default class UploadUtil {
    constructor() {
        this.getTokenUrl = '';
        this.uploadToken = '';
        this.uploadUrl = '';
        this.uploadedImgUrl = '';

        this.getToken();
    }

    getToken = () => {
        wx.request({
            url: this.getTokenUrl,
            success: (res) => {
                const { uptoken } = res.data;
                if (uptoken && uptoken.length > 0) {
                    this.uploadToken = uptoken
                } else {
                    console.error('----- 0xg -----')
                }
            },
            fail: function (error) {
                console.error('---- 0xg -----: ' + error)
            }
        })
    }

    getRandomName = (filePath = '') => {
        const a = parseInt(Math.random() * 10);
        const b = parseInt(Math.random() * 10);
        const c = parseInt(Math.random() * 10);
        const d = parseInt(Math.random() * 10);
        const ext = filePath.substring(filePath.lastIndexOf('.'));
        return `0xg_${Date.now()}_${a}${b}${c}${d}${ext}`;
    }

    wxUpload = (filePath, resolve, reject, chooseIndex, cb) => {
        const randomName = this.getRandomName(filePath);
        wx.uploadFile({
            url: this.uploadUrl,
            filePath,
            name: 'file',
            formData: {
                'token': this.uploadToken,
                'key': randomName,
                'name': randomName,
            },
            success: res => {
                const dataString = res.data;
                try {
                    const dataObject = JSON.parse(dataString);
                    const fileName = this.uploadedImgUrl + dataObject.key;
                    resolve(fileName);
                    typeof cb === 'function' && cb(fileName, chooseIndex);
                } catch(e) {
                    reject(res);
                    console.log('parse JSON failed, origin String is: ' + dataString)
                }
            },
            fail: (error) => {
                reject(error);
            }
        })
    }

    _uploadFile = (filePath, resolve, reject, chooseIndex, cb) => {
        if (typeof resolve === 'function') {
            this.wxUpload(filePath, resolve, reject, chooseIndex, cb);
        } else {
            return new Promise((resolve, reject) => {
                this.wxUpload(filePath, resolve, reject, chooseIndex, cb);
            })
        }
    }

    /**
     * 压缩图片
     * @param {*} imgPath 图片临时文件
     * @param {*} chooseIndex 选择图片的顺序
     */
    compressAndUpload = (imgPath, chooseIndex, cb, componentCtx) => {
        return new Promise((resolve, reject) => {
            wx.getImageInfo({
                src: imgPath,
                success: res => {
                    const { height, width, path } = res;
                    const longerSide = height >= width ? height : width;
                    if (longerSide > 1280) {
                        // 压缩尺寸
                        const compressedW = longerSide === width ? 1280 : parseInt((1280 / height) * width);
                        const compressedH = longerSide === height ? 1280 : parseInt((1280 / width) * height);
                        componentCtx.setData({
                            compressedW,
                            compressedH,
                        }, () => {
                            const ctx = wx.createCanvasContext('compress_canvas');
                            ctx.drawImage(path, 0, 0, width, height, 0, 0, compressedW, compressedH);
                            setTimeout(() => {
                                ctx.draw(false, () => {
                                    wx.canvasToTempFilePath({
                                        x: 0,
                                        y: 0,
                                         compressedW,
                                        height: compressedH,
                                        destWidth: compressedW,
                                        destHeight: compressedH,
                                        canvasId: 'compress_canvas',
                                        fileType: 'jpg',
                                        success: res => {
                                            const compressedSizeImagePath = res.tempFilePath;
                                            this.compressImageQuality(compressedSizeImagePath, resolve, reject, chooseIndex, cb);
                                        },
                                        fail: res => {
                                            console.log('canvasToTempFilePath fail: ', res);
                                            reject(res);
                                        },
                                    })
                                });
                            }, 1000)
                        });
                    } else {
                        // 直接压缩质量
                        this.compressImageQuality(path, resolve, reject, chooseIndex, cb);
                    }
                }
            })
        });
    }

    /**
     * 按照80%比例压缩质量
     */
    compressImageQuality = (compressedSizeImagePath, resolve, reject, chooseIndex, cb) => {
        wx.getFileInfo({
            filePath: compressedSizeImagePath,
            success: res => {
                if (res.size > maxImageSize) {
                    wx.compressImage({
                        src: compressedSizeImagePath,
                        quality: 80,
                        success: res => {
                            this.compressImageQuality(res.tempFilePath, resolve, reject, chooseIndex, cb);
                        },
                        fail: res => {
                            console.log('compressImage fail: ', res)
                            reject(res);
                        }
                    })
                } else {
                    this._uploadFile(compressedSizeImagePath, resolve, reject, chooseIndex, cb);
                }
            },
            fail: res => {
                reject(res);
            },
        })
    }
}

/**
 * files: [{ name: '', index: 0, status: 'uploaded | uploading', isVideo: true | false }]
 */

import UploadUtil from '@utils/upload_utils';
const uploadUtil = new UploadUtil();

const movableAreaPaddingW = 15;

const maxImageNum = 9;
const maxVideoNum = 1;

const maxVideoSize = 5 * 1024 * 1024;
const maxImageSize = 500 * 1024;

function getFilesNum(files) {
    let imageNum = 0;
    let videoNum = 0;
    for (let i = 0; i < files.length; i++) {
        const { isVideo } = files[i];
        if (isVideo) {
            ++videoNum;
        } else {
            ++imageNum;
        }
    }
    return {
        imageNum,
        videoNum,
    }
}

function getFileTypeFromExt(fileName) {
    if (typeof fileName !== 'string') return;

    if (
        fileName.indexOf('.jpg') > -1 ||
        fileName.indexOf('.jpeg') > -1 ||
        fileName.indexOf('.png') > -1 ||
        fileName.indexOf('.bmp') > -1 ||
        fileName.indexOf('.webp') > -1
    ) {
        return 'image';
    } else {
        return 'video';
    }
}

Component({
    properties: {
        defaultsFiles: {
            type: Array,
            value: [],
        }
    },
    data: {
        movableAreaW: 0,
        maxNumPerRow: 0,
        compressedW: 0,
        compressedH: 0,
        imageWidth: 0,
        files: [],
        movingIndex: 0,
        movable: false
    },
    ready() {
        const { windowWidth } = wx.getSystemInfoSync();
        const movableAreaW = windowWidth - movableAreaPaddingW * 2;
        const maxNumPerRow = parseInt(movableAreaW/imageWidth);

        const { defaultsFiles } = this.data;
        this.setData({
            movableAreaW,
            maxNumPerRow,
            movingIndex: 0,
            movable: false,
            files: defaultsFiles.map((item, index) => ({ ...item, index }))
        });
    },
    methods: {
        chooseFile: () => {
            const { files } = this.data;
            const { imageNum, videoNum } = getFilesNum(files);
            const canUploadImageNum = maxImageNum - imageNum;
            const canUploadVideoNum = maxVideoNum - videoNum;

            if (canUploadImageNum > 0 && canUploadVideoNum > 0) {
                wx.showActionSheet({
                    itemList: ['选择照片', '选择视频'],
                    success: res => {
                        const { tapIndex } = res;
                        const count = tapIndex === 0 ? canUploadImageNum : canUploadVideoNum;
                        this.chooseLocalFile(tapIndex, count);
                    }
                })
            } else if (canUploadImageNum > 0 && canUploadVideoNum === 0) {
                this.chooseLocalFile(0, canUploadImageNum);
            } else if (canUploadImageNum === 0 && canUploadVideoNum > 0) {
                this.chooseLocalFile(1, canUploadImageNum);
            }
        },

        chooseLocalFile(type, maxNum) {
            if (type === 0) {
                wx.chooseImage({
                    count: maxNum,
                    success: res => {
                        // compress && upload
                        console.log('res: ', res);
                        const { tempFiles } = res;
                        // 如果想要更好的体验，可以使用临时文件先渲染已添加列表，
                        // 在编辑其它信息的过程中，让用户无感知地进行上传，实现起来也很简单，这里就不实现这种方式了
                        // const { files } = this.data;
                        // const newFiles = [...files, tempFiles.map((item, index) => ({name: item.path, index: files.length + index}))];
                        // this.setData({
                        //     files: newFiles
                        // });
                        this.createUploadImageTask(tempFiles);
                    }
                });
            } else if (type === 1) {
                wx.chooseVideo({
                    count: 1,
                    maxDuration: 30,
                    success: res => {
                        this.createUploadVideoTask(res);
                    }
                })
            }
        },

        imgPosRealTime(x, y) {
            const { maxNumPerRow, imageWidth, files } = this.data;
            const lastRowNum = files.length%maxNumPerRow;
    
            const row = parseInt(y/(imageWidth + 10));
            const col = parseInt(x/(imageWidth + 10));
            const endIndex = row * maxNumPerRow + col;
    
            return { lastRowNum, row, col, endIndex };
        },

        handleChangePos: e => {
            const { dataset } = e.currentTarget;
            const { index } = dataset;
            const { x, y, source } = e.detail;
            if (source === 'touch') {
                const imgPos = this.imgPosRealTime(x + imageWidth/3, y + imageWidth/3);
                this.moveEndInfo = {...imgPos, index, x, y};
            }
        },

        handleChangePosStart: e => {
            const { dataset } = e.currentTarget;
            const { index } = dataset;
            this.setData({
                movingIndex: index
            });
        },

        /**
         * 拖拽结束才可以setData，小程序开发的整个过程都要考虑setData的次数，越少越好
         */
        handleChangePosEnd: () => {
            if (!this.moveEndInfo) return;

            const { files } = this.data;
            const { index, endIndex } = this.moveEndInfo;
            const movingImg = files[index];

            if (endIndex === files.length) {
                files[index] = movingImg;
            } else {
                if (endIndex > index) {
                    for (let i = 0; i < files.length; i++) {
                        if (i >= index && i <= endIndex) {
                            files[i] = files[i + 1];
                        }
                    }
                } else if (endIndex < index) {
                    for (let i = files.length - 1; i >= 0; i--) {
                        if (i <= index && i >= endIndex) {
                            files[i] = files[i - 1];
                        }
                    }
                }
                files[endIndex] = movingImg;
            }

            this.setData({
                files,
                movable: false,
            });
            this.moveEndInfo = null;
        },

        /**
         * 单击预览
         */
        handleTapItem: e => {
            const { dataset } = e.currentTarget;
            const { index } = dataset;

            const { files, themeType } = this.data;
            if ((themeType === 4 || themeType === 1) && index === 0) {
                this.videoContext = wx.createVideoContext('preview-video', this);

                this.videoContext.requestFullScreen({
                    direction: 0
                });
                this.videoContext.play();
            } else {
                wx.previewImage({
                    urls: [files[index].name]
                });
            }
        },

        videoFullScreenChange: e => {
            const { fullScreen } = e.detail;
            if (!fullScreen) {
                this.videoContext.pause();
            }
        },

        /**
         * 长按激活拖拽
         */
        handleLongPressMovableItem: () => {
            wx.vibrateShort();
            component.setData({
                movable: true,
            })
        },

        deleteFile: (e) => {
            const { files } = this.data;
            const { dataset } = e.currentTarget;
            const { index } = dataset;
            const newFiles = [
                ...files.slice(0, index),
                ...files.slice(index + 1),
            ];
            this.setData({
                files: newFiles.map(((item, index) => ({...item, index}))), // 重置索引
            });
        },

        createUploadImageTask: async tempFiles => {
            wx.showLoading({
                title: '正在上传...'
            });
            const { files } = this.component.getComponentData();
            const compressAndUploadQueue = [];
            const uploadQueue = [];

            for (let i = 0; i < tempFiles.length; i++) {
                const chooseIndex = files.length + i;
                const { size, path } = tempFiles[i];
                if (size > maxImageSize) {
                    const compressAndUploadItem = uploadUtil.compressAndUpload(path, chooseIndex, this.fileAdded, this);
                    compressAndUploadQueue.push(compressAndUploadItem);
                } else {
                    const uploadItem = this.uploadFile(path, '', '', chooseIndex, this.fileAdded);
                    uploadQueue.push(uploadItem);
                }
            }
            await Promise.all([...compressAndUploadQueue, ...uploadQueue]);
            wx.hideLoading();
            console.log('---- all files uploaded ----');
        },
    
        createUploadVideoTask: async file => {
            wx.showLoading({
                title: '正在上传...'
            });
            const { size, tempFilePath } = file;
            if (size > maxVideoSize) {
                wx.hideLoading();
                wx.showModal({
                    title: '提示',
                    content: '视频大小不能超过5M，上传大于5M视频请前往app',
                    showCancel: false,
                    confirmText: '知道了'
                })
            } else {
                await this.uploadFile(tempFilePath);
                wx.hideLoading();
            }
        },
    },

    fileAdded(fileName, chooseIndex) {
        const fileType = getFileTypeFromExt(fileName);
        let videoImg = '';
        if (fileType === 'video') {
            videoImg = fileName + '?first_frame/0'; // 首帧
        }
        // 处理files
        const { files } = this.data;
        const newFile = { name: videoImg || fileName, status: 'uploaded' };
        let newFiles = [];
        if (fileType === 'video') {
            newFiles = [
                {
                    ...newFile,
                    index: 0,
                    source: fileName
                },
                ...files.map(item => ({...item, index: item.index + 1}))
            ];
        } else {
            let index = 0;
            for (let i = 0; i < files.length; i++) {
                const pre = files[i];
                const next = files[i + 1];
                if (!pre) {
                    index = 0;
                    break;
                } else if (!next) {
                    const { index: indexPre } = pre;
                    if (indexPre > chooseIndex) {
                        index = i;
                    } else {
                        index = i + 1;
                    }
                    break;
                }

                const { index: indexPre } = pre;
                const { index: indexNext } = next;
                if (indexPre < chooseIndex && indexNext > chooseIndex) {
                    index = i + 1;
                    break;
                }
            }
            const insertItem = {...newFile, index: chooseIndex};
            newFiles = [
                ...files.slice(0, index),
                insertItem,
                ...files.slice(index),
            ];
        }
        this.setData({
            files: newFiles
        })
    },
})

4.wxml文件，使用movable-area和movable-view实现拖拽功能

<!-- 已上传文件  -->
<view class="page__bd">
    <view class="weui-cells" style="margin-top: 0px;">
        <view class="weui-cell">
            <view class="weui-cell__bd">
                <view class="weui-uploader">
                    <view
                        class="weui-uploader__files"
                        id="uploaderFiles"
                        style="height: {{(imageW + paddingW * 2) * WXS.getRowsNum(files, maxNumPerRow)}}px;"
                    >
                        <movable-area style=" 100%; height: 100%;">
                            <block wx:for="{{files}}" wx:key="unique">
                                <movable-view
                                    animation="{{false}}"
                                    direction="all"
                                    disabled="{{!movable}}"
                                    style="padding: 5px;  {{imageW}}px; height: {{imageW}}px; z-index: {{movingIndex === index ? 1000 : 0}}"
                                    x="{{WXS.getAddedImgPos(index, maxNumPerRow, imageW + paddingW * 2).x}}"
                                    y="{{WXS.getAddedImgPos(index, maxNumPerRow, imageW + paddingW * 2).y}}"
                                    data-index="{{index}}"
                                    bindchange="{{handleChangePos}}"
                                    bindtouchstart="{{handleChangePosStart}}"
                                    bindtouchend="{{handleChangePosEnd}}"
                                    bindtap="{{handleTapItem}}"
                                    bindlongtap="{{handleLongPressMovableItem}}"
                                >
                                    <view style=" 100%; height: 100%;position: relative;">
                                        <image class="weui-uploader__img" src="{{item.name}}" mode="aspectFill" />
                                        <view wx:if="{{item.status === 'uploading'}}" class="weui-uploader__file-content">
                                            <view class="weui-loading"></view>
                                        </view>
                                        <view
                                            wx:if="{{item.isVideo}}"
                                            class="f-flex f-vc f-hc play-icon"
                                        >
                                            <image
                                                src="/assets/images/video_icon.png"
                                                style=" {{imageW/maxNumPerRow}}px; height: {{imageW/maxNumPerRow}}px;"
                                            />
                                        </view>
                                        <image
                                            data-index="{{index}}"
                                            class="uploader-img-delete"
                                            src="/assets/images/delete-img.png"
                                            catchtap="{{deleteFile}}"
                                        />
                                    </view>
                                </movable-view>
                            </block>
                            <movable-view
                                wx:if="{{files.length < 10}}"
                                animation="{{false}}"
                                direction="all"
                                disabled
                                style=" {{imageW}}px; height: {{imageW}}px; padding: 5px;"
                                x="{{WXS.getAddedImgPos(files.length, maxNumPerRow, imageW + paddingW * 2).x}}"
                                y="{{WXS.getAddedImgPos(files.length, maxNumPerRow, imageW + paddingW * 2).y}}"
                                data-index="{{-1}}"
                            >
                                <view
                                    style=" {{imageW}}px; height: {{imageW}}px;background-color: #F5F5F5;"
                                    class="f-flex f-vc f-hc weui-uploader__file"
                                    bindtap="{{chooseFile}}"
                                >
                                    <image src="/assets/images/add-file.png" style=" {{imageW/maxNumPerRow}}px; height: {{imageW/maxNumPerRow}}px;" />
                                </view>
                            </movable-view>
                        </movable-area>
                    </view>
                </view>
            </view>
        </view>
    </view>
</view>

<!-- 视频预览 -->
<video
    id="preview-video"
    src="{{videoURL}}"
    style="position: absolute; left: 5000px;"
    bindfullscreenchange="{{videoFullScreenChange}}"
/>
<!-- 图片尺寸压缩画布 -->
<canvas
    canvas-id="compress_canvas"
    style=" {{compressedW}}px; height: {{compressedH}}px; position: absolute; left: 10000px;"
/>

通过写博客的方式来review代码，会比只是看代码印象深刻；希望通过这种方式让自己搬砖搬得更厉害。