<input id="button1" type="button" value="按我" />
<script language="javascript">
window.onload=function(){
var obj=document.getElementById("button1");
(function(){
var str="看到我了吧";
var func=function(){
alert(str);
}
if (document.all)
obj.attachEvent("onclick",func);
else
obj.addEventListener("click",func,false);
})();
alert(typeof(str));
}
</script>