​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>单击该按钮以创建一个 OUTPUT 元素。</p>
​
<form id="myForm" oninput="x.value=parseInt(a.value)+parseInt(b.value)">0
  <input type="range" id="a" value="50">100
  +<input type="number" id="b" value="50">=
</form>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.createElement("OUTPUT");
  x.setAttribute("name", "x");
  x.setAttribute("for", "a b");
  document.getElementById("myForm").appendChild(x);
  document.getElementById("demo").innerHTML = "output 元素已创建。请更改 range 或 number 字段的值以查看计算结果。";
}
</script>
​
</body>
</html>
​