!!测试

var _msg = "";
_msg += "开始："+new Date().getTime();
_msg += "开始："+new Date().getTime();
$(".test").html(_msg);
alert(_msg);

console.log( new Date().getTime() );

<script type="text/javascript" src="http://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
var timer;
$(window).scroll(function () {
clearTimeout(timer);
timer = setTimeout(function () {
console.log(new Date().getTime());
console.log($(document).scrollTop());
}, 100);
});
});
</script>

$("#aa").trigger("click");

<script type="text/javascript">
$(function(){
$("#button").click(function(){

});
});
</script>
<input type="button" id="button">