2017 年 9 月 27 日 js(文本框内容添加到select)

写法

<!DOCTYPE html>
<html>
   <head>
       <meta charset="UTF-8">
       <title></title>
       <style>
           #sy{
               300px;
           }
       </style>
   </head>
   <body>
           <select id="sy"   size="7">

           </select>
           <input type="text" id="tx1"/>
           <input type="button" id="s1" value="提交" />
   </body>
</html>
<script>
   var tx1 = document.getElementById("tx1")
   var s1 = document.getElementById("s1")
   var sy = document.getElementById("sy")
   s1.onclick = function(){
       sy.innerHTML += "<option>"+ tx1.value+"</option>"
       tx1.value = ""
   }
</script>