JS篩選器的製作

<select onchange="filterschool()"></select>
<select onchange="filterdirection()"></select>
<a onclick="filterhot(1)">最新</a>
<a onclick="filterhot(2)">最熱</a>
<script type="text/javascript">
  var schoolvalue = 0,
      directionvalue = 0,
      hotvalue = 0;
  function filterschool(){
      var obj = document.getElementById("filter-school");
      var index = obj.selectedIndex;
      schoolvalue = obj.options[index].value;
      creaturl()
      };
  function filterdirection(){
      var obj = document.getElementById("filter-direction");
      var index = obj.selectedIndex;
      directionvalue = obj.options[index].value;
      creaturl()
      }
  function filterhot(hot){
      hotvalue = hot;
      creaturl()
      }
  function creaturl(){
    url = schoolvalue+"/"+directionvalue+"/"+hotvalue;
    console.log(url)
  }
  </script>

界面：

兩個select標籤，學校、方向。

兩個a標籤分別是最熱、最新。

選擇任意，生成一個url，實現篩選效果。