代码示例：（标识：hdom_button_value）
<!DOCTYPE html>
<html>
<body>
<form id="frm1" action="/index/demo/form_current.html">
<button id="btn1" name="subject" type="submit" value="fav_HTML">HTML</button>
<button id="btn2" name="subject" type="submit" value="fav_CSS">CSS</button>
</form>
<p>单击“试一试”按钮返回“HTML”按钮的值：</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("btn1").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
