关于年份,周数的下拉列表

js  获取一个年份下拉列表

 function selectDate(){
    var oYear = document.getElementById("sltYear");  //从循环中获取年份
    /*
    *先获取当前年份，然后当年分小于2020年时，循环获取
    *从2009年到2020年的一个数组
*/
    for (var i=(new Date()).getFullYear()-3; i <=2020; i++){   
        oYear.add(new Option(i, i)); 
    } 
}

php根据年份和周数确定日期

    function getWeekList($year){    //根据年份获取周数及日期
        $key = "kechengbiao_weeklist_".$year;
        $weeklist = getSqlCacheData($key);
        if(!$weeklist) {    
            global $adb;
            $weeklist=array();
            for($w=1;$w<=52;$w++){
                $starttime = $this->getWeekDate($year,$w);
                $startdate = date("m/d",strtotime ($starttime));
                $enddate = date("m/d",strtotime ($starttime."+6 day"));
                $text = $w."($startdate-$enddate)";
                $weeklist[$w] = $text;
            }
            setSqlCacheData($key,$weeklist);
        }
        return $weeklist;
    }

    function getWeekListOpt($year,$week){   //根据年份,周数获取下拉列表
        $weeklist = $this->getWeekList($year);
        $optionhtml = '';
        for($w=1;$w<=52;$w++)
        {
            if($w == $week){
                $optionhtml .= '<option value="'.$w.'" selected="selected">'.$weeklist[$w].'</option>';
            }else{
                $optionhtml .= '<option value="'.$w.'">'.$weeklist[$w].'</option>';
            }
        }
        return $optionhtml;
    }