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超轻量级php框架startmvc

Vue+mui实现图片的本地缓存示例代码

更新时间:2020-07-10 19:06:01 作者:startmvc
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:constmenu={state:

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:


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: {
 }
}

总结

以上所述是小编给大家介绍的Vue+mui实现图片的本地缓存示例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!

mui 图片缓存 mui本地缓存 vue mui 缓存