JS實現網頁頂部向下滑出的全國城市切換導航效果
編輯：關於JavaScript
本文實例講述了JS實現網頁頂部向下滑出的全國城市切換導航效果。分享給大家供大家參考。具體如下：
這是一款JS版網頁頂部向下滑出的城市切換導航，仿sohu團購網頁頂部的城市導航切換，從頂部向下滑出，方便在其他城市之間切換。使用了sohu網原版的一個JS封裝插件來實現，目前只是為了演示，所以全國城市不全，使用者自己添加吧。
運行效果截圖如下：
在線演示地址如下：
http://demo.jb51.net/js/2015/js-web-scroll-city-cha-style-codes/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>網頁頂部向下滑出的切換城市導航</title>
<style>
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,form,img,dl,dt,dd,table,th,td,blockquote,fieldset,div,strong,label,em{margin:0;padding:0;border:0;}
ul,ol,li{list-style:none;}
input,button{margin:0;font-size:12px;vertical-align:middle;}
body{font-size:12px;font-family:Arial, Helvetica, sans-serif; text-align:center; margin:0 auto;}
table{border-collapse:collapse;border-spacing:0;}
p{line-height:24px}
.clearfloat{height:0;font-size:1px;clear:both;line-height:0;}
#container{ width:960px; text-align:left; margin:0 auto; }
a{color:#333;text-decoration:none;}
a:hover{color:#ef9b11; text-decoration:underline;}
.header{ background:url(images/tuan_head_01.gif) repeat-x; height:32px;}
.header .topCtiy {PADDING-RIGHT: 10px; PADDING-TOP: 4px; HEIGHT: 22px}
.header .topCtiy UL {FLOAT: right}
.header .topCtiy LI {PADDING-RIGHT: 10px; DISPLAY: inline; PADDING-LEFT: 10px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN-LEFT: 3px; COLOR: #fff; LINE-HEIGHT: 22px; PADDING-TOP: 0px}
.header .topCtiy LI.i1 {PADDING-RIGHT: 13px; PADDING-LEFT: 13px; FONT-WEIGHT: bold; FONT-SIZE: 14px; BACKGROUND: #e16e6e; PADDING-BOTTOM: 0px; PADDING-TOP: 0px}
.header .topCtiy LI.i2 {BACKGROUND: url(images/tuan_icon10.gif) no-repeat 100% 50%; CURSOR: pointer}
.header .topCtiy LI A {COLOR: #fff}
.header .topCtiy LI A:hover {COLOR: #fff}
.selCity {PADDING-RIGHT: 0px; PADDING-LEFT: 0px; Z-INDEX: 10; BACKGROUND: url(images/tuan_bgx06.gif) #7e2725 repeat-x 50% bottom; PADDING-BOTTOM: 4px; WIDTH: 100%; PADDING-TOP: 2px; POSITION: relative;}
.selCity .none {LEFT: 47.5%; BOTTOM: -18px; POSITION: absolute}
.selCity .none A {DISPLAY: block; BACKGROUND: url(images/tuan_bg15.gif) no-repeat; WIDTH: 68px; TEXT-INDENT: -3000px; HEIGHT: 21px; TEXT-DECORATION: none}
.selCity .none A:hover {DISPLAY: block; BACKGROUND: url(images/tuan_bg15.gif) no-repeat; WIDTH: 68px; TEXT-INDENT: -3000px; HEIGHT: 21px; TEXT-DECORATION: none}
.selCity TABLE {MARGIN: 0px auto; WIDTH: 950px; BORDER-COLLAPSE: collapse}
.selCity TABLE TD {BORDER-RIGHT: #8b3d3b 1px dashed; BORDER-TOP: #8b3d3b 1px dashed; FONT-SIZE: 14px; VERTICAL-ALIGN: middle; BORDER-LEFT: #8b3d3b 1px dashed; WIDTH: 157px; COLOR: #fff; BORDER-BOTTOM: #8b3d3b 1px dashed; HEIGHT: 39px; TEXT-ALIGN: center}
.selCity TABLE TD A {DISPLAY: block; COLOR: #fff; LINE-HEIGHT: 40px; HEIGHT: 40px; TEXT-DECORATION: none}
.selCity TABLE TD A:hover {BACKGROUND: #a86e6d; COLOR: #fff; TEXT-DECORATION: none}
.selCity TABLE TD A.cur {BACKGROUND: #a86e6d}
.header .box {MARGIN-TOP: 36px; TEXT-ALIGN: left}
.header .lab_city {MARGIN-TOP: 1px; FLOAT: left; WIDTH: 210px; COLOR: #fff; POSITION: relative; HEIGHT: 25px}
.header .sel_fl {PADDING-RIGHT: 10px; PADDING-LEFT: 10px; BACKGROUND: #400a09; LEFT: -97px; PADDING-BOTTOM: 27px; WIDTH: 361px; PADDING-TOP: 23px; POSITION: absolute; TOP: 28px}
.header .sel_fl TABLE {BORDER-COLLAPSE: collapse}
.header .sel_fl TABLE TD {
BORDER-RIGHT: #8b3d3b 1px dashed; BORDER-TOP: #8b3d3b 1px dashed; FONT-SIZE: 14px; VERTICAL-ALIGN: middle; BORDER-LEFT: #8b3d3b 1px dashed; WIDTH: 88px; COLOR: #fff; BORDER-BOTTOM: #8b3d3b 1px dashed; HEIGHT: 34px; TEXT-ALIGN: center}
.header .sel_fl TABLE TD.first {BORDER-LEFT-WIDTH: 0px}
.header .sel_fl TABLE TD.last {BORDER-RIGHT-WIDTH: 0px}
.header .sel_fl TABLE TD A {DISPLAY: block; LINE-HEIGHT: 34px; HEIGHT: 34px; TEXT-DECORATION: none}
.header .sel_fl TABLE TD A:hover {DISPLAY: block; LINE-HEIGHT: 34px; HEIGHT: 34px; TEXT-DECORATION: none}
.header .sel_fl TABLE TD A:hover {BACKGROUND: #5c2f2e}
.header .sel_fl TABLE TD A.cur {BACKGROUND: #5c2f2e}
.header .lab_city .city {FONT-WEIGHT: bold; FONT-SIZE: 14px; BACKGROUND: url(images/tuan_bg01.gif) no-repeat 100% 0px; FLOAT: left; WIDTH: 70px; LINE-HEIGHT: 25px; MARGIN-RIGHT: 16px; TEXT-ALIGN: center}
.header .lab_city .txt {DISPLAY: inline-block; CURSOR: pointer; PADDING-TOP: 8px}
</style>
</head>
<BODY>
<DIV class=selCity id=allCity style="DISPLAY: none">
<DIV class=area>
<TABLE>
<TBODY>
<TR>
<TD><A class=cur href="#">北京</A></TD>
<TD><A href="#">上海</A></TD>
<TD><A href="#">廣州</A></TD>
<TD><A href="#">深圳</A></TD>
<TD><A href="#">西安</A></TD></TR>
<TR>
<TD><A href="#">天津</A></TD>
<TD><A href="#">南京</A></TD>
<TD><A href="#">成都</A></TD>
<TD><A href="#">杭州</A></TD>
<TD><A href="#">濟南</A></TD></TR>
<TR>
<TD><A href="#">哈爾濱</A></TD>
<TD><A href="#">海南</A></TD>
<TD><A href="#">沈陽</A></TD>
<TD><A href="#">大連</A></TD>
<TD><A href="#">石家莊</A></TD></TR>
<TR>
<TD><A href="#">長春</A></TD>
<TD><A href="#">鄭州</A></TD>
<TD> </TD>
<TD> </TD>
<TD> </TD>
<TD> </TD></TR></TBODY></TABLE>
<DIV class=none><A id=foldin href="javascript:;">收起</A></DIV></DIV></DIV>
<DIV class=header>
<DIV class=area>
<DIV class=r>
<DIV class="topCtiy clear">
<UL>
<LI class=i1>北京 </LI>
<LI class=i2 id=changeCity>切換城市 </LI>
</UL>
</DIV>
</DIV>
</DIV>
</DIV>
<SCRIPT src="js/sohu.js" type=text/javascript></SCRIPT>
<SCRIPT type=text/javascript>
jQuery(function(){
$("#changeCity").click(function(a){$("#allCity").slideDown(300);a.stopPropagation();$(this).blur()});$("#allCity").click(function(a){a.stopPropagation()});$(document).click(function(a){a.button!=2&&$("#allCity").slideUp(300)});$("#foldin").click(function(){$("#allCity").slideUp(300)})
});
</SCRIPT>
<br /><br />
<p></p>
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。
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