​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>演示如何访问隐藏输入字段</h1>
​
<input type="hidden" id="myInput" value="W3School">
​
<p>单击按钮可获取隐藏输入字段的值。</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var x = document.getElementById("myInput").value;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​