<HTML>
<script>
function aa()
{
document.all.t1.disabled=true
}
</script>
<body><form action="" name="3">
<input type="text" id="t1">
<input type="button" onclick="aa()" value="dd">
</form>
</body>
</HTML>
<script>
function aa()
{
document.all.t1.disabled=true
}
</script>
<body><form action="" name="3">
<input type="text" id="t1">
<input type="button" onclick="aa()" value="dd">
</form>
</body>
</HTML>
<input type=text value="灰豆宝宝.net" onclick="this.disabled='true'">