h5+ 实时网速

var nowsize="";记录上次下载数据包大小
var st=new Date()记录上次刷新进度条时间

case 3:
                                var et=new Date() 
                                var current = parseInt(100 * task.downloadedSize / task.totalSize);
                                // plus.notification.setProgress(current); //插件调用
                                document.getElementById("jdt").style.display="";  
                                document.getElementById("jdt").style.width=current+'%';
                                if(((et-st)/1000)>1){
                                    document.getElementById("jdt").innerText=current+'%'+"|"+changeSize((1000*(task.downloadedSize-nowsize))/(et-st))+"/s";
                                    nowsize=task.downloadedSize;   
                                    st=new Date(); 
                                } 
                                break;

网络速度转换

        function changeSize(size) {
                var num;
                if((size / 1024) <= 1024) {
                    num = size / 1024;
                    return num.toFixed(2) + 'KB';
                }
                else if((size / 1024) > 1024 && (size / 1024) <= (1024 * 1024)) {
                    num = (size / 1024) / 1024;
                    return num.toFixed(2) + 'M';
                }
                else if((size / 1024) > (1024 * 1024)) {
                    num = ((size / 1024) / 1024) / 1024
                    return num.toFixed(2) + 'G';
                }
                else{
                    return size + 'B'; 
                }
        }