W3Schools 在线编辑工具 V3.0

<html>
<head>
<script type="text/javascript">
function alertId()
  {
  var txt="Id: " + document.getElementById("myButton").id
  txt=txt + ", type: " + document.getElementById("myButton").type
  txt=txt + ", value: " + document.getElementById("myButton").value
  alert(txt)
  document.getElementById("myButton").disabled=true
  }
</script>
</head>
<body>

<form>
<input type="button" value="Click me!" id="myButton" onclick="alertId()" />
</form>

</body>
</html>

W3Schools 在线编辑工具（TIY） V3.0