HTML DOM id属性

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Definition and Usage

The id property sets or returns the id of the button.

buttonObject.id=id

The following example gets the id of the button:

<html>

<head>
<script type="text/javascript">
function alertId()
{
alert(document.getElementById("myButton").id)
}
</script>
</head>

<body>
<form>

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

</html>