var timestamp =1539598555000;//时间戳

//时间戳转换成time格式
function timestampToTime(timestamp) {

        var date = new Date(timestamp );//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() + ' ';

        h = date.getHours() + ':';

        m = date.getMinutes() + ':';

        s = date.getSeconds();

        return Y+M+D+h+m+s;

    }
var dateTime =timestampToTime(timestamp)//转换时间戳

alert(dateTime);