App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<body>
<form id="myForm" action="demo_keygen.php" method="get">
  Username: <input type="text" name="usr_name">
  Encryption: <keygen id="myKeygen" name="security">
  <input type="submit">
</form>
<p>点击 "点我" 按钮返回 keygen 字段所属表单的id。</p>
<p id="demo"></p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var x = document.getElementById("myKeygen").form.id;
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html>
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運(yùn)行結(jié)果