<input type="button" value="btn1" id="btn1"/>
<input type="button" value="btn2" id="btn2"/>
<input type="button" value="btn3" id="btn3"/>
<script type="text/javascript">
for(var i=1;i<=3;i++){
document.getElementById('btn' + i).onclick = (function(j){
return function(){
alert(j);
}
})(i);
}
</script>

<input type="button" id="btn1" value="按鈕1" />
<input type="button" id="btn2" value="按鈕2" />
<input type="button" id="btn3" value="按鈕3" />
<input type="button" id="btn4" value="按鈕4" />
<input type="button" id="btn5" value="按鈕5" />
<input type="button" id="btn6" value="按鈕6" />
<input type="button" id="btn7" value="按鈕7" />

$(function () {
var i;
for (i = 1; i <= 7; i++) {
$("#btn" + i).bind("click", { id: i }, dis);
}
});

function dis(evt) {
alert(evt.data.id);
}