Result Size: 625 x 534
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<!DOCTYPE html>
<html>
<body>
<h3>如何访问隐藏输入字段的演示</h3>
<input type="hidden" id="myInput" value="BEGTUT">
<p>单击按钮以获取隐藏输入字段的值。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myInput").value;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>