$(function(){
var $window = $(window),
$content = $(".content"),
$sticky = $(".sticky"),
topContent = $content.offset().top;
$window.on("scroll", function(){
if ($window.scrollTop() > topContent){
$sticky.slideDown();
}else{
$sticky.slideUp();
}
});
$window.trigger("scroll");
});
最後にtrigger使う理由がいまいち分からない
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