js获取当前时间前一天 当天

前一天

var time=(new Date).getTime()-24*60*60*1000;
        var yesday=new Date(time);
        var month=yesday.getMonth();
        var day=yesday.getDate();
        yesday=yesday.getFullYear() + "-" + (yesday.getMonth()> 9 ? (yesday.getMonth() + 1) : "0" + (yesday.getMonth() + 1)) + "-" +(yesday.getDate()> 9 ? (yesday.getDate()) : "0" + (yesday.getDate()));

打印结果

当天

        var myDate = new Date();     //获取当前年份(2位)
        var year=myDate.getFullYear();    //获取完整的年份(4位,1970-????)
        var month=myDate.getMonth();       //获取当前月份(0-11,0代表1月)
        var day=myDate.getDate();        //获取当前日(1-31)
        var dayNow=year+'-'+(month+1)+"-"+day;

打印结果