$（window）.scroll（）在页面加载时触发 [英] $(window).scroll() firing on page load

问题描述

有没有办法防止在页面加载时触发$ code> $（window）.scroll（）？

Is there a way to prevent $(window).scroll() from firing on page load?

在Firefox 4中测试以下代码，即使拔下鼠标也会触发。

Testing the following code in Firefox 4, it fires even when I unplug the mouse.

jQuery(document).ready(function($){    
$(window).scroll(function(){
                console.log("Scroll Fired");
    });
});

推荐答案

scroll 事件与鼠标无关，只要设置了新的文档滚动位置，就会调用它。并且可以说，当文档加载时，您的位置将被设置（您可以使用锚点加载该位置），如果用户按下键盘上的光标键也是如此。我不知道为什么你需要忽略最初的滚动事件，但是我猜想如果 pageYOffset 为零。这很简单：

The scroll event is unrelated to the mouse, it is called whenever a new document scrolling position is set. And arguably that position is set when the document loads (you might load it with an anchor after all), also if the user presses a cursor key on his keyboard. I don't know why you need to ignore the initial scroll event but I guess that you only want to do it if pageYOffset is zero. That's easy:

var oldPageYOffset = 0;
$(window).scroll(function(){
  if (window.pageYOffset != oldPageYOffset)
  {
    oldPageYOffset = window.pageYOffset;
    console.log("Window scrolling changed");
  }
});

注意：MSIE没有窗口.pageYOffset 属性，所以以上需要调整。可能jQuery提供了跨浏览器的替代方案。

Note: MSIE doesn't have window.pageYOffset property so the above will need to be adjusted. Maybe jQuery offers a cross-browser alternative.

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