js判断时间间隔

js判断，如果某条件不为空(accNo)，则起始日期与结束日期不超过半年，若为空，则起始日期与结束日期不超过一年

function checkDate(){
        var accNo = $("#accNo").val();
        if(null == accNo || accNo == ''){
            var pattern = /(\d{4})(\d{2})(\d{2})/;
            var beginTimeStr = $("#startDate").val().replace(pattern, '$1-$2-$3');
            var endTimeStr = $("#endDate").val().replace(pattern, '$1-$2-$3');
            var beginTime = new Date(beginTimeStr).getTime();
            var endTime = new Date(endTimeStr).getTime();
            sum = endTime - beginTime;
            if(endTime < beginTime){
                alertInfo("起始日期不能大于终止日期！");
                return false;
            }
            if(parseInt(Math.abs(beginTime-endTime)/1000/60/60/24) > 183){
                alertInfo("起始时间与终止时间不能超过183天！");
                return false;
            }
        }else{
            var pattern = /(\d{4})(\d{2})(\d{2})/;
            var beginTimeStr = $("#startDate").val().replace(pattern, '$1-$2-$3');
            var endTimeStr = $("#endDate").val().replace(pattern, '$1-$2-$3');
            var beginTime = new Date(beginTimeStr).getTime();
            var endTime = new Date(endTimeStr).getTime();
            sum = endTime - beginTime;
            if(endTime < beginTime){
                alertInfo("起始日期不能大于终止日期！");
                return false;
            }
            if(parseInt(Math.abs(beginTime-endTime)/1000/60/60/24) > 365){
                alertInfo("起始时间与终止时间不能超过365天！");
                return false;
            }
        }
        
    }

js判断时间间隔

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