数据多js平均时间取固定条数展示，echarts数据多处理数据

js代码：

function getfailurerate(start,end,ip) {
    $.ajax( {
        url : "report/getvirtual.action",
        type : "POST",
        data : {
            'ip' : ip,
            'startime' : start,
            'endtime' : end,
        },
        timeout : 180000,
        async : true,
        beforeSend: function(){
            MaskUtil.mask(); 
            var net = new Array();
            var createtime = new Array();
            var lnet = new Array();
            var lnet_out = new Array();
            var net_out = new Array();
            var net_avg = new Array();
            var cpu = new Array();
            var mem = new Array();
            vhostNet(net,net_out,lnet,lnet_out,net_avg,createtime);
            vhostCpu(cpu,createtime);
            vhostMem(mem,createtime);
        },
        success : function(data) {
            MaskUtil.unmask(); 
            var data = eval(data);
            if(data== null || data.length<1){
                alert("暂无数据！");
            }
            var net = new Array();
            var createtime = new Array();
            var lnet = new Array();
            var lnet_out = new Array();
            var net_out = new Array();
            var net_avg = new Array();
            var cpu = new Array();
            var mem = new Array();
            
            var sum = 0; 
            var count = 0;
            //如果大于三个月
            var smonth = start.substring(8,10);
            var emonth = end.substring(8,10);
//            if((emonth - smonth) > 3){
            //如果大于多少条
            var item = 1000;//条数
            if(data.length > item){
                var timestamp = parseInt(new Date().getTime()/1000);
//                start = start.substring(0,19);如果时间格式有问题时使用
//                start = start.replace(/-/g,'/'); 
                var s = new Date(data[0].createtime.substring(0, 16)).getTime();
                sum = s;
                var e = new Date(data[data.length-1].createtime.substring(0, 16)).getTime();
                //计算起止时间的平均值，用来每次添加数据后增长时间
                count = parseInt((e-s)/item);
                for(var j = 0 ; j<data.length; j++){
//                    var sumdate = getTimeDate(sum + count);
                    var sumdate = getTimeDate(sum);//不加count会多一条开始时间的数据
                    var ctime = data[j].createtime.substring(0, 16);
                    var date1 = new Date(sumdate);
                    var date2 = new Date(ctime);
                    //如果所要时间小于数据时间或与数据时间相等，添加数据并增长所要时间
                    if(date1 < date2 || date1 - date2 == 0){
                        net.push(data[j].net);
                        createtime.push(data[j].createtime);
                        lnet.push(data[j].lnet);
                        lnet_out.push(data[j].lnet_out);
                        net_out.push(data[j].net_out);
                        net_avg.push(data[j].net_avg);
                        cpu.push(data[j].cpu);
                        mem.push(data[j].memory);
                        sum = sum + count;
                    }
                }
                var sumdate = getTimeDate(sum);
            }else{
                //如果不符合条件，走普通
                for(var j = 0 ; j < data.length; j++){
                    net.push(data[j].net);
                    createtime.push(data[j].createtime);
                    lnet.push(data[j].lnet);
                    lnet_out.push(data[j].lnet_out);
                    net_out.push(data[j].net_out);
                    net_avg.push(data[j].net_avg);
                    cpu.push(data[j].cpu);
                    mem.push(data[j].memory);
                }
            }
            vhostNet(net,net_out,lnet,lnet_out,net_avg,createtime);
            vhostCpu(cpu,createtime);
            vhostMem(mem,createtime);
        }
    });
}
function getTimeDate(timedate) {
//    var s = new Date(d);
//    var sdate = (s.getFullYear()) + "-" + 
//       (s.getMonth() + 1) + "-" +
//       (s.getDate()) + " " + 
//       (s.getHours()) + ":" + 
//       (s.getMinutes()) + ":" + 
//       (s.getSeconds());
}
function getTimeDate(timedate) {
    var s = new Date(timedate);
    var date = (s.getFullYear()) + "-" + 
      (s.getMonth() + 1) + "-" +
      (s.getDate()) + " " + 
      (s.getHours()) + ":" + 
      (s.getMinutes());
//     + ":" + (s.getSeconds());
    return date;
}