javascript时间处理

1、将一般格式时间转换为时间戳：

var systime = "2018年04月28日 16:01:09";
systime = systime.replace('年', "/").replace('月', "/").replace('日', '');
systime = new Date(systime).getTime();

2、将毫秒数转换为时分秒：

var runtime = 6*60*60*1000;
var day = Math.floor(runtime/(24*60*60*1000));    
var h = Math.floor((runtime%(24*60*60*1000))/(60*60*1000));    
var m = Math.floor(((runtime%(24*60*60*1000))%(60*60*1000))/(60*1000));
var s = Math.floor((((runtime%(24*60*60*1000))%(60*60*1000))%(60*1000))/1000);

3、动态显示获取到的系统时间和时长：

<div id="serviceTime"></div>

    var serviceTime = document.getElementById("serviceTime");
    console.log("========【获取系统时间和时长】模块开始========");
    $.ajax({
        type: "POST",
        url: "/monitor/monitoring/nodes_info/",
        data: {},
        dataType: 'json',
        timeout: 1000 * 60,
        success: function(obj){
            if(obj){
                //解析当前时间
                var systime = obj.sysinfo.systime;//获取当前时间："2018年04月28日 16:01:09"
                systime = systime.replace('年', "/").replace('月', "/").replace('日', '');
                systime = new Date(systime).getTime();
                console.log("当前时间时间戳：");
                console.log(systime);
                //解析时长
                var runtime = obj.sysinfo.runtime;//获取当前时长："13天7小时58分17秒"
                var indexOfDay = runtime.indexOf("天");
                var indexOfHour1 = runtime.indexOf("小");
                var indexOfHour2 = runtime.indexOf("时");
                var indexOfMinutes = runtime.indexOf("分");
                var indexOfSecond = runtime.indexOf("秒");
                var runtimeDay = runtime.substring(0, indexOfDay); 
                var runtimeHour = runtime.substring(indexOfDay+1, indexOfHour1); 
                var runtimeMinutes = runtime.substring(indexOfHour2+1, indexOfMinutes); 
                var runtimeSecond = runtime.substring(indexOfMinutes+1, indexOfSecond); 
                runtime = runtimeDay*24*60*60*1000 + runtimeHour*60*60*1000 + runtimeMinutes*60*1000 + runtimeSecond*1000;
                console.log("当前时长毫秒数：");
                console.log(runtime);
                
                setInterval(function(){
                    var time = new Date(systime);
                    var year = time.getFullYear();
                    var month = time.getMonth() + 1;
                    var date = time.getDate();
                    if (date >= 0 && date <= 9) {
                        date = "0" + date;
                    }
                    var hour = time.getHours();
                    if (hour >= 0 && hour <= 9) {
                        hour = "0" + hour;
                    }
                    var minutes = time.getMinutes();
                    if (minutes >= 0 && minutes <= 9) {
                        minutes = "0" + minutes;
                    }
                    var seconds= time.getSeconds();
                    if (seconds >= 0 && seconds <= 9) {
                        seconds = "0" + seconds;
                    }
                    
                     var day = Math.floor(runtime/(24*60*60*1000));    
                     var h = Math.floor((runtime%(24*60*60*1000))/(60*60*1000));    
                     var m = Math.floor(((runtime%(24*60*60*1000))%(60*60*1000))/(60*1000));
                     var s = Math.floor((((runtime%(24*60*60*1000))%(60*60*1000))%(60*1000))/1000);

                    serviceTime.innerHTML = "运行时长：" + day + "天" + h + "时" + m + "分" + s + "秒 "+ " 系统时间：" + year + "年" + month + "月" + date + "日 " + hour + ":" + minutes + ":" + seconds;
                    systime += 1000;
                    runtime += 1000;
                }, 1000);
            }else{
                toastr.error("获取系统时间和时长时返回数据为空！", "警告");
                console.log("获取系统时间和时长时返回数据为空！");
            }
            
        },
        error: function(msg){
            toastr.error("获取系统时间和时长时系统错误！", "警告");
            console.log("获取系统时间和时长时系统错误！");
            console.log(msg);
        }
    });