在项目中遇到需要支持上传gif图片，并把其分解的帧图片一次展示给用户。话不多说直接上代码
分解gif图片需要使用libgif-js这个库！
1. 引入Git库
import SuperGif from './libgif.js'
2. 分解Gif为png图片
const GifDecomposer = { structureGifObject (gifFiles, cb) { // gifFiles 获取的文件对象 e.target.files[0] const gifImg = document.createElement('img'); gifImg.setAttribute('rel:animated_src', URL.createObjectURL(gifFiles)); gifImg.setAttribute('rel:auto_play', '0'); // Modified pictures must be added to the body document.body.appendChild(gifImg); // Construction example var rub = new SuperGif({ gif: gifImg }); rub.load(() => { var img_list = []; for (let i=1; i <= rub.get_length(); i++) { // Traversing through each frame of a GIF instance rub.move_to(i); // Converting each frame of canvas into a file object let cur_file = this.convertCanvasToImage(rub.get_canvas(), gifFiles.name.replace('.gif', '') + `-${i}`) img_list.push({ file_name: cur_file.name, url: URL.createObjectURL(cur_file), file: cur_file, }) } cb(img_list) }); }, dataURLtoFile (dataurl, filename) { const arr = dataurl.split(','); const mime = arr[0].match(/:(.*?);/)[1]; const bstr = atob(arr[1]); var n = bstr.length; const u8arr = new Uint8Array(n); while (n--) { u8arr[n] = bstr.charCodeAt(n); } return new File([u8arr], filename, {type:mime}); }, convertCanvasToImage (canvas, filename) { return this.dataURLtoFile(canvas.toDataURL('image/png'), filename); } }
3. 上传每一张图片
/** * costume upload GIF decomposer */ const filesImg = function (list, storage, costumeFormat, assetType, handleCostume) { let proDataList = list.map((item, index) => { return new Promise(function(resolve, reject) { let reader = new FileReader(); reader.readAsArrayBuffer(item.file); reader.onload = () => { let data = {result: reader.result, type: item.file.type, name: item.file.name} resolve(data); }; reader.onerror = (error) => {reject(error)}; }) }) Promise.all(proDataList).then(res => { res.forEach(item => { // 上传 }) }).catch(data => {console.log(data)}) }