有人可以告诉我为什么我的JS可能会跑得超慢吗?
我有什么办法可以加快速度吗?
谢谢!
$(document).ready(function() {
/* Every time the window is scrolled ... */
$(window).scroll( function(){
/* Check the location of each desired element */
$('.hideme').each( function(i){
var bottom_of_object = $(this).offset().top + $(this).outerHeight();
var bottom_of_window = $(window).scrollTop() + $(window).height();
/* If the object is completely visible in the window, fade it it */
if( bottom_of_window > bottom_of_object ){
$(this).animate({'opacity':'1'},500);
}
});
});
});
答案 0 :(得分:-2)
我无法帮助,但请注意您如何拨打$()
来引用this
和window
。这是一个次要的表现建议:
$(document).ready(function() {
$(window).scroll( function(){
$('.hideme').each( function(i){
var $el = $(this),
$window = $(window),
bottom_of_object = $el.offset().top + $el.outerHeight(),
bottom_of_window = $window.scrollTop() + $window.height();
if( bottom_of_window > bottom_of_object )
$el.animate({'opacity':'1'},500);
});
});
});