下面一段代码给大家分享基于Vue+mui实现图片的本地缓存,具体代码如下所示:
在延边朝鲜族等地区,都构建了全面的区域性战略布局,加强发展的系统性、市场前瞻性、产品创新能力,以专注、极致的服务理念,为客户提供做网站、成都网站设计 网站设计制作定制开发,公司网站建设,企业网站建设,成都品牌网站建设,成都全网营销推广,外贸营销网站建设,延边朝鲜族网站建设费用合理。const menu = { state: { products: {}, GLOBAL_CONFIG:GLOBAL_CONFIG['GLOBAL_CONFIG'] }, mutations: { get_product: function (state, products) { //商品列表 state.products = products; for(let i = 0; i < state.products.length; i++){ if(state.products[i]['image'] != null){ // state.products[i]['image'] = state.GLOBAL_CONFIG['base64Header'] + state.products[i]['image']; //下载图片到本地 this.commit('imgCache',state.products[i]); }else{ //添加默认图片 state.products[i]['image'] = require("../assets/file.png"); } } }, imgCache: function (state,imgObj) { mui.plusReady(function(){ // 1. 转换网络图片地址为本地缓存图片路径,判断该图片是否存在本地缓存 // http://...jpg -> md5 // 缓存目录 _downloads/image/(md5).jpg let image_url = imgObj.image; let image_md5 = md5(image_url); // 缓存本地图片url let local_image_url = '_downloads/image/'+image_md5+'.jpg'; // 平台绝对路径 let absolute_image_path = plus.io.convertLocalFileSystemURL(local_image_url); console.log(absolute_image_path); // 判断本地是否存在该文件,存在就就直接使用,否则就下载 plus.io.resolveLocalFileSystemURL( absolute_image_path, function( entry ) { if(entry){ imgObj.image = plus.io.convertLocalFileSystemURL(local_image_url); }else{ download_img(); } }, function ( e ) { console.log("Resolve file URL failed: "); download_img(); } ); function download_img(){ // filename:下载任务在本地保存的文件路径 let download_task = plus.downloader.createDownload(image_url, { filename: local_image_url }, function(download, status) { // 下载失败,删除本地临时文件 if(status != 200){ console.log('下载失败,status'+status); if(local_image_url != null){ plus.io.resolveLocalFileSystemURL(local_image_url, function(entry) { entry.remove(function(entry) { console.log("临时文件删除成功" + local_image_url); // 重新下载图片 download_img(); }, function(e) { console.log("临时文件删除失败" + local_image_url); }); }); } }else{ // 把下载成功的图片显示 // 将本地URL路径转换成平台绝对路径 console.log("下载成功" + local_image_url); imgObj.image = plus.io.convertLocalFileSystemURL(local_image_url); } }); download_task.start(); } }); } }, actions: { } }