jQuery 向下滚动 1000px 后更改 CSS 类
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Change CSS class after scrolling 1000px down
提问by taylor
I want a fixed menu to appear in the left column of my site once the user scrolls 1000px down, but am not very experienced with jQuery/JS. I thought something like this would work but it isn't doing anything:
一旦用户向下滚动 1000 像素，我希望在我网站的左栏中显示一个固定菜单，但我对 jQuery/JS 的经验不是很丰富。我认为这样的事情会起作用，但它没有做任何事情：
HTML:
HTML：
<div id="menu">[MENU_WILL_GO_HERE]</div>
STYLE:
风格：
#menu{display:none;}?
JQ:
江青：
var fixed = false;
?$(document).scroll(function() {
if( $(this).scrollTop() > 100 ) {
if( !fixed ) {
fixed = true;
$('#menu').css({position:'fixed', display:'block'});
}
} else {
if( fixed ) {
fixed = false;
$('#menu').css({display:'none'});
}
}
});?
Q:
问：
Is there a reason this doesn't work? The code is an example on http://jsfiddle.net/roXon/psvn9/1/, and even when I copy/paste that example exactly as it is into a blank html page, with a link of the latest jquery library, it still doesn't work like it does on that jsfiddle page. What could I be overlooking?
有没有理由这不起作用？该代码是http://jsfiddle.net/roXon/psvn9/1/上的示例，即使我将该示例完全按原样复制/粘贴到空白 html 页面中，并带有最新 jquery 库的链接，它仍然不能像在那个 jsfiddle 页面上那样工作。我可以忽略什么？
回答by AlienWebguy
Your braces are wrong in your example, but regardless, you can simplify your code:
您的示例中的大括号是错误的，但无论如何，您可以简化代码：
CSS:
CSS:
#menu {
display : none;
position : fixed;
}
JS:
JS：
$(document).scroll(function() {
$('#menu').toggle($(this).scrollTop()>1000)
});?
回答by Gautam3164
Edit like this
像这样编辑
if( $(this).scrollTop() > 1000 )
you are looking for 1000px scroll,but it appears 100px due to this,from your code
您正在寻找 1000px 滚动，但由于这个原因，从您的代码中它显示为 100px
