时间戳的转换

（一）时间戳转为当前时间

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var a = 1594810549   console.log(timestampToTime(a)) //2020-07-15->18:55:49   function timestampToTime(timestamp){     var date = new Date(timestamp * 1000);//时间戳为10位需*1000，时间戳为13位的话不需乘1000     Y = date.getFullYear() + '-';     M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';     D = date.getDate() < 10 ? '0'+(date.getDate()) : date.getDate();     h = date.getHours() + ':';     m = date.getMinutes() + ':';     s = date.getSeconds();     return Y+M+D+ '->' +h+m+s; }

　　

（二）当前时间转为时间戳

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var date = new Date('2020-7-15 18:55:49:123');//后三位为毫秒     var time1 = date.getTime();     var time2 = date.valueOf();     var time3 = Date.parse(date);     console.log(time1);//1594810549123     console.log(time2);//1594810549123     console.log(time3);//1594810549000

　附带一个for in 小循环

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var b = [1,2,3,4] for(let index in b){     console.log(b[index]) }