js获取当前日期前一个月

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var nowDate = new Date();

        var yesterdayDate = new Date(nowDate.getTime() - 24*60*60*1000); //前一天

        var nowMonth = nowDate.getMonth()+1;

        nowMonth = nowMonth<9?"0"+nowMonth:nowMonth;

        var nowDay = nowDate.getDate()<10?"0"+nowDate.getDate():nowDate.getDate();

        var yesterdayMonth = yesterdayDate.getMonth()+1;

        yesterdayMonth = yesterdayMonth<9?"0"+yesterdayMonth:yesterdayMonth;

        var yesterdayDay = yesterdayDate.getDate()<10?"0"+yesterdayDate.getDate():yesterdayDate.getDate();

        var yesterdayDateStr = yesterdayDate.getFullYear() + "-" + yesterdayMonth + "-" + yesterdayDay;

        var nowDateStr = nowDate.getFullYear() + "-" + nowMonth + "-" + nowDay;

        $('#startId').val(yesterdayDateStr);

        $('#endId').val(nowDateStr);