JavaScript实现Select下拉框值获取与自定义属性传递

<!doctype html>
<html>
<head lang="en">
 <meta charset="UTF-8">
</head>
<body>
 <select onchange="test(event)">
  <option>安静</option>
  <option>晴天</option>
  <option>七里香</option>
 </select>
 <script type="text/javascript">
  function test (e) {
   var e = event ? event : window.event;
   alert(e.target.value);
  }
 </script>
</body>
</html>

<!doctype html>
<html>
<head lang="en">
 <meta charset="UTF-8">
</head>
<body>

 <select onchange="test(event)" id="sel"></select>

 <script type="text/javascript">
  //定义内容的json数据，一般从后台获取
  var data = [
   {
    name: '晴天',
    id: '1'
   },
   {
    name: '安静',
    id: '2'
   },
   {
    name: '七里香',
    id: '3'
   }
  ];

  createOption('sel',data);
  //创建option
  function createOption(parentId, data){
   var parentId = document.getElementById(parentId);
   for(var i=0; i<data.length; i++){
    var opt = document.createElement('option');
    //设置option的值
    opt.innerHTML = data[i].name;
    //定义option的自定义值
    opt.setAttribute('dataid', data[i].id);
    parentId.appendChild(opt);
   }
  }
  //选取自定义属性的方法
  function test (e) {
   var e = event ? event : window.event;
   var target = e.target;
   var index = target.selectedIndex;
   alert("我的id="+target[index].getAttribute('dataid'));
  }
 </script>
</body>
</html>