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mui HTML5 plus 下载文件

<header class="mui-bar mui-bar-nav">    <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a>    <h1 class="mui-title">下载</h1></header><div class="mui-content">    <div class="mui-progressbar" id="bar">        <span></span>    </div>    <button class="mui-btn mui-btn-block mui-btn-green" onclick="createDownload();">开始下载</button></div><script src="js/mui.js" type="text/javascript" charset="utf-8"></script><script type="text/javascript">//初始化下载对象    var dtask = null;    function createDownload(){        //判断文件是否已经下载plus.io.resolveLocalFileSystemURL('_downloads/Snip_V2.0_5771.dmg',function(entry){            if(entry.isFile){                mui.toast('已经下载');                mui.alert(entry.fullPath);            }        },function(e){dBase();});    }    function dBase(){        if(dtask){            mui.toast('下载任务已经存在');            return;        }        dtask = plus.downloader.createDownload(            'http://snip.qq.com/resources/Snip_V2.0_5771.dmg',{method:'GET'},function(d,status){            mui.toast(d.filename);        });        dtask.addEventListener("statechanged",function(task,status){            if(!dtask){return;}            switch(task.state){                case 1: mui.toast('开始下载...');break;//开始                case 2: mui.toast('链接到服务器...');break;//链接到服务器                case 3:                    var progressVal = (task.downloadedSize/task.totalSize)*100;                        mui('#bar').progressbar({progress:progressVal}).show();                    break;                case 4: mui.toast('下载完成');break;            }        });        dtask.start();    }</script>

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