js获取本月开始时间和结束时间

var firstDate = new Date();        var startDate = firstDate.getFullYear()+"-"+((firstDate.getMonth()+1)<10?"0":"")+(firstDate.getMonth()+1)+"-"+"01";        //alert(firstDate.getFullYear()+"-"+((firstDate.getMonth()+1)<10?"0":"")+(firstDate.getMonth()+1)+"-"+"01");        var date=new Date();        var currentMonth=date.getMonth();        var nextMonth=++currentMonth;        var nextMonthFirstDay=new Date(date.getFullYear(),nextMonth,1);        var oneDay=1000*60*60*24;        var lastDate =  new Date(nextMonthFirstDay-oneDay);        var  endDate = lastDate.getFullYear()+"-"+((lastDate.getMonth()+1)<10?"0":"")+(lastDate.getMonth()+1)+"-"+(lastDate.getDate()<10?"0":"")+lastDate.getDate();        //alert(lastDate.getFullYear()+"-"+((lastDate.getMonth()+1)<10?"0":"")+(lastDate.getMonth()+1)+"-"+(lastDate.getDate()<10?"0":"")+lastDate.getDate());

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