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$(".product_Simgs ul li").remove();
for (var i = 1; i <= parseInt($(this).attr("imgnum")); i++) {
var li = "<li><span>" + i + "/" + parseInt($(this).attr("imgnum")) + "</span></li>";
$(".product_Simgs ul").append($(li));
}
$(".product_Simgs ul li").mouseover(function () {
alert("over");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(".product_Simgs ul li").on('mouseover',function () {
alert("over");
});
</script>
$(".product_Simgs ul li").live({
mouseenter: function () {
alert("over");
}
});
$(".product_Simgs ul li").live("mouseover", function () {
alert("over");
});
Try it