​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>单击该按钮可创建一个 SELECT 和一个 OPTION 元素。</p>
​
<button onclick="myFunction()">试一试</button>
​
<br><br>
​
<script>
function myFunction() {
  var x = document.createElement("SELECT");
  x.setAttribute("id", "mySelect");
  document.body.appendChild(x);
​
  var z = document.createElement("option");
  z.setAttribute("value", "volvocar");
  var t = document.createTextNode("Volvo");
  z.appendChild(t);
  document.getElementById("mySelect").appendChild(z);
}
</script>
​
</body>
</html>
​