下面代码中if语句，如果加入else后，所设置的if语句无法正常运行的原因是什么？

Question

例如下面代码：<script type="text/javascript">
      window.onload= function w(){
          function e(i){
              if(i<10){
                  i="0"+i;
              }else{
                  return i;}
              }
          
          var time=new Date();
          var year=time.getFullYear();
          var month=time.getMonth()+1;
          var day=time.getDate();
          var week=time.getDay()
          var weekday=new Array();
            weekday[0]="星期日";
            weekday[1]="星期一";
            weekday[2]="星期二";
            weekday[3]="星期三";
            weekday[4]="星期四";
            weekday[5]="星期五";
            weekday[6]="星期六";
          var h=time.getHours();
          var m=time.getMinutes();
         
          var s=time.getSeconds();
           m=e(m);
           s=e(s);
        document.getElementById("first1").innerHTML=year+"年"+month+"月"+day+"日"+weekday[week]+h+":"+m+":"+s;
           setTimeout(w,500)
        }
         
        </script>

Answer 1

if里面也需要returnif(i<10){     i="0"+i;     return i; }else{     return i;} }