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我有这个page，你可以看到有一个菜单栏会在我滚动页面时滚动。那很好。但是我希望它在它自己下面遇到一个特定的对象时停下来并向上滚动。防止固定位置对象在特定地点滚动页面
这样做的最佳方法是什么？谢谢你们。
下面是HTML：
<title>some theme</title>
<body>
<div id="Navigator">
<div class="logo">
<img class="svg" src="images/logo.svg" alt="My Logo" />
</div>
<ul>
<li><a href="#">Home</a>
</li>
</ul>
</div>
<div id="Container">
<div id="Content"></div>
</div>
<div id="Footer">
<div id="Links"></div>
<div id="CopyRight"></div>
</div>
<div class="content">
<div class="post">
<h2>Post 1</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut tempus, nisi ac fermentum rhoncus, leo elit luctus ex, id lobortis magna <a href="http://shahinism.github.io">Here is a link</a> libero ac orci. Integer eu ligula eu velit suscipit pretium nec ac turpis. Duis nec metus posuere, gravida lorem quis, gravida orci. Vestibulum blandit ultricies egestas. Aenean quis sagittis urna. Morbi nisi risus, vulputate sit amet ante nec, facilisis scelerisque ex. Aenean sagittis tempus nibh, at pellentesque leo venenatis eget. Cras eleifend turpis ipsum, nec tempus magna commodo malesuada. Aenean dignissim ex id tincidunt molestie.</p>
<p>Quisque congue vehicula cursus. Donec quis elit augue. Nulla augue felis, venenatis non sem at, aliquam porttitor libero. Sed pellentesque, ex quis imperdiet aliquet, diam velit tincidunt dolor, quis lacinia massa leo vitae risus. Vestibulum eget tincidunt augue. Pellentesque sollicitudin, urna ac porttitor sollicitudin, eros nisl porttitor urna, a volutpat nunc tortor sed diam. Sed fermentum elit at pellentesque aliquam. Praesent interdum odio id elit sodales semper. Morbi dapibus accumsan faucibus. Proin tincidunt nulla eu neque sodales convallis. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Donec dignissim tincidunt tempor. Praesent a molestie ligula. Vivamus tempus massa nec enim finibus, in facilisis risus convallis. Proin efficitur euismod tristique.</p>
<p>Integer feugiat nunc vel blandit fermentum. Vestibulum tristique et metus vitae condimentum. Phasellus malesuada scelerisque tincidunt. Aliquam a pharetra magna, vitae finibus urna. Sed ante nisi, consectetur eget interdum a, venenatis ac lorem. Vivamus dignissim justo non mauris placerat, sed pulvinar sapien eleifend. Pellentesque commodo malesuada nulla, sit amet aliquam ipsum consectetur id. Mauris sagittis sapien at scelerisque hendrerit. Vivamus elementum lacus ac ultricies dictum. Praesent imperdiet eleifend odio in interdum. Aenean quis nunc massa. Duis at tellus vel quam hendrerit faucibus at vitae sem. Praesent ut mi rutrum, rutrum lorem eget, placerat metus.</p>
</div>
</div>
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
<script>
$(".placeholder-input").on("blur", function() {
$(this).toggleClass("not-empty", !! $(this).val());
});
</script>
和CSS：
/* Color definitions
------------------------------- */
/* Reset base html elements */
@import url(http://fonts.googleapis.com/css?family=Open+Sans);
html, body, ol {
margin: 0;
padding: 0;
}
body {
background: #fdf6e3;
font-family:"Open Sans";
}
#Navigator {
background-color: #002b36;
bottom: 0;
position: fixed;
left: 0;
width: 100%;
height: 44px;
border-top: 5px solid #268bd2;
padding: 0;
}
#Navigator ul {
width: 75%;
margin: 0 10px;
padding: 0px;
}
#Navigator ul li {
float: left;
list-style: none;
}
#Navigator ul li a {
color: #fdf6e3;
border-left: 0px solid #dc322f;
text-decoration: none;
display: block;
padding: 12px 10px;
display: block;
width: 63px;
height: 24px;
text-align: center;
transition: all 0.25s;
}
#Navigator ul li a:hover {
background: #268bd2;
border-left-width: 5px;
}
#Navigator .logo {
float: left;
width: 9%;
height: 44px;
}
#Navigator .logo img {
height: 43px;
margin: 0 10px;
}
#Navigator .search {
float: right;
width: 20%;
font-size: 16px;
}
#Navigator .search .field {
height: 40px;
position: relative;
}
#Navigator .search .field .placeholder-label {
position: absolute;
font-weight: 300;
color: #333333;
cursor: text;
z-index: 200;
transition: all 0.25s;
top: 10px;
left: 8px;
}
#Navigator .search .field .placeholder-label:after {
content:":";
opacity: 0;
color: #fdf6e3;
transition: all 0.25s;
}
#Navigator .search .field .placeholder-input {
background: #93a1a1;
top: 5px;
position: absolute;
width: 180px;
padding: 7px;
border-radius: 6px;
border: 1px solid #657b83;
font-size: 14px;
z-index: 100;
transition: all 0.25s;
}
#Navigator .search .field .placeholder-input:focus, #Navigator .search .field .placeholder-input.not-empty {
margin-left: 70px;
width: 110px;
}
#Navigator .search .field .placeholder-input:focus + .placeholder-label, #Navigator .search .field .placeholder-input.not-empty + .placeholder-label {
cursor: default;
color: #fdf6e3;
}
#Navigator .search .field .placeholder-input:focus + .placeholder-label:after, #Navigator .search .field .placeholder-input.not-empty + .placeholder-label:after {
opacity: 1;
}
.content .metadata {
float: left;
width: 17%;
padding: 10px;
font-size: 11px;
color: #93a1a1;
}
.content .post {
text-align: justify;
float: left;
width: 60%;
background-color: white;
border-width: 0 10px;
border-color: #eee8d5;
border-style: solid;
padding: 10px;
}
.content a {
color: #268bd2;
text-decoration: none;
padding-bottom: 3px;
padding: 0;
position: relative;
}
.content a:after {
content:"";
background: none repeat scroll 0 0 #d33682;
position: absolute;
height: 1px;
bottom: 0;
left: 50%;
right: 50%;
transition: all 0.25s;
}
.content a:hover:after {
height: 2px;
left: 0;
right: -4px;
}
.content a:hover {
color: #d33682;
}
.content a:visited {
color: #6c71c4;
}
.content a:visited:hover {
color: #d33682;
}