app 版本升级

cordova plugin add cordova-plugin-appversion //获取当前版本号

cordova plugin add cordova-plugin-file-transfer  //下载

          判断平台
　　　　　　let vm = this
          let browser = {   versions: function () {
            let u = navigator.userAgent, app = navigator.appVersion;
            return {//移动终端浏览器版本信息
              trident: u.indexOf(‘Trident‘) > -1, //IE内核
              presto: u.indexOf(‘Presto‘) > -1, //opera内核
              webKit: u.indexOf(‘AppleWebKit‘) > -1, //苹果、谷歌内核
              gecko: u.indexOf(‘Gecko‘) > -1 && u.indexOf(‘KHTML‘) == -1, //火狐内核
              mobile: !!u.match(/AppleWebKit.*Mobile/i) || !!u.match(/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/), //是否为移动终端
              ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
              android: u.indexOf(‘Android‘) > -1 || u.indexOf(‘Linux‘) > -1, //android终端或者uc浏览器
              iPhone: u.indexOf(‘iPhone‘) > -1 || u.indexOf(‘Mac‘) > -1, //是否为iPhone或者QQHD浏览器
              iPad: u.indexOf(‘iPad‘) > -1, //是否iPad
              webApp: u.indexOf(‘Safari‘) == -1 //是否web应该程序，没有头部与底部
            };   } (),
            language: (navigator.browserLanguage || navigator.language).toLowerCase() }
          if (browser.versions.iPhone || browser.versions.iPad || browser.versions.ios ) {
    
            vm.platform = 1 
          } if (browser.versions.android) {
            vm.platform = 2
          }
        //platform ==1 ios平台，2安卓平台
       

let vm = this
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fs) {
          let url = ‘url‘;
          fs.root.getFile(‘userApp.apk‘, {create: true, exclusive: false},
            function (fileEntry) {
              download(fileEntry.toURL(), url);
            }, onErrorCreateFile);
        }, onErrorLoadFs);
        function download(fileEntry, url) {
          let ft = new FileTransfer();
          let fileURL = fileEntry;
          ft.onprogress = function (e) {
    　　　　//获取进度
            if (e.lengthComputable) {
              vm.percentShow = true
　　　　　　　　//进度e.loaded / e.total

           vm.$set(vm.percent,‘num‘,parseInt( e.loaded / e.total * 100, 10)) 
           const colorMap = [‘#FFA55E‘]
           vm.$set(vm.percent,‘strokeColor2‘,colorMap[parseInt( e.loaded / e.total * 3, 10)])
          } 
        }
       ft.download(url, fileURL, function (entry) {
         cordova.plugins.fileOpener2.open( fileEntry, ‘application/vnd.android.package-archive‘, {
           error : function(e) { 
             console.log(‘Error status: ‘ + e.status + ‘ - Error message: ‘ + e.message);
           }, success : function () { console.log(‘file opened successfully‘); 
          } 
         } ); 
       }, function (err) { 
           alert("下载失败！:"+JSON.stringify(err)); 
       }, null, // or, pass false 
       { 
           //headers: { 
             // "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA==" 
           //} }); 
       } 
       //文件创建失败回调 
       function onErrorCreateFile(error) { 
         alert("文件创建失败！") 
       } 
       //FileSystem加载失败回调 
       function onErrorLoadFs(error) { 
         alert("文件系统加载失败！") 
      }