jQuery 显示加载更多(节流) 实现预加载

(function () {
var showMoreNChildren = function ($children, n) {
//显示某jquery元素下的前n个隐藏的子元素
var $hiddenChildren = $children.filter(":hidden");
var cnt = $hiddenChildren.length;
for (var i = 0; i < n && i < cnt ; i++) {
$hiddenChildren.eq(i).show();
var temp=$hiddenChildren.eq(i).find('img');
temp.attr("src",temp.attr("_src"));
}
return cnt - n;//返回还剩余的隐藏子元素的数量
}
jQuery.showMore = function (selector) {
if (selector == undefined) { selector = ".showMoreNChildren" }
//对页中现有的class=showMorehandle的元素，在之后添加显示更多条，并绑定点击行为
$(selector).each(function () {
var pagesize = $(this).attr("pagesize") || 10;
var $children = $(this).children();
if ($children.length > pagesize) {
for (var i = pagesize; i < $children.length; i++) {
$children.eq(i).hide();
}
$("<div class='last_but showMorehandle'> <div id='btnTest'>查看更多 </div></div>").insertAfter($(this)).click(function () {

if (showMoreNChildren($children, pagesize) <= 0) {
//如果目标元素已经没有隐藏的子元素了，就隐藏“点击更多的按钮条”
$(this).hide();
};
});
}
});
}
})()

<div class="container-fluid">
<ul class="showMoreNChildren" pagesize="10">
${获取理财列表}

<li>

</li>
</ul>

</div>