Javascript 如何编辑jQuery动画出现在元素的中间？

现在，一旦完整元素在窗口中可见，该元素就会淡入。有没有办法编辑这个，这样我可以更快地触发淡入淡出动画？理想情况下，当只有一半元素而不是整个元素可见时，将触发淡入淡出动画

以下是触发此动画的JavaScript：

/* every time the window is scrolled ... */
 $(window).scroll( function(){
    /* check the location of each desired element */
    $('.fade-in').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 in */
        if( bottom_of_window > bottom_of_object ){
            $(this).animate({'opacity':'1'},600);
        }
    });
});
});

---

无论是在if部分还是在计算中，试着把你的目标的底部减半

 /* every time the window is scrolled ... */
     $(window).scroll( function(){
        /* check the location of each desired element */
        $('.fade-in').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 in */
            if( bottom_of_window > (bottom_of_object / 2) ){
                $(this).animate({'opacity':'1'},600);
            }
        });
    });
    });

---

无论是在if部分还是在计算中，试着把你的目标的底部减半

 /* every time the window is scrolled ... */
     $(window).scroll( function(){
        /* check the location of each desired element */
        $('.fade-in').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 in */
            if( bottom_of_window > (bottom_of_object / 2) ){
                $(this).animate({'opacity':'1'},600);
            }
        });
    });
    });

---

将对象的

bottom\u

值更改为小于其原始高度的值

var bottom_of_object = $(this).offset().top + $(this).outerHeight() / 3; //we dived by 3 here at the end.

---

将对象的

bottom\u

值更改为小于其原始高度的值

var bottom_of_object = $(this).offset().top + $(this).outerHeight() / 3; //we dived by 3 here at the end.