1.锚点跳转简介

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锚点其实就是可以让页面定位到某个位置上的点。在高度较高的页面中经常见到。比如百度的百科页面，wiki中的page内容。

我知道实现锚点的跳转有两种形式，一种是a标签+name属性；还有一种就是使用标签的id属性。百度百科就是使用a标签的name属性来实现锚点跳转的。

比如：

<a href=”#2”>波轮洗衣机介绍</a> <a name=”2”></a>

但是上种方法使用了一个空标签，而且有时候会出现锚点失效。所以建议采用id来绑定锚点，代码如下：

	
			<a href=”#2”>波轮洗衣机介绍 <h2 id=”2”>波轮洗衣机介绍</h2>

2.含锚点跳转的URL地址

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【1】关于#

在页面的制作中，”#”的符号很常见，并且具有通用性。基本上，其表示的含义是id选择符。例如：CSS中#header{}就表示id为header的标签的样式如何；在JQuery中，$(“#header”)表示选择id为header的标签为JQuery对象；同样的，在页面的URL中，”#”也可以理解为id选择符之意，也就是页面跳转到含URL指向的id的标签处。

例如输入一个地址 http://baike.baidu.com/view/121416.htm?pf=1#3

这个地址中末尾有个”#”，这个就相当于告诉浏览器要跳转了，#后面跟着的3表示会在http://baike.baidu.com/view/121416.htm?pf=1 的页面中寻找符合”#3”特点的标签，并且执行跳转。

【2】关于空锚点指向

如果URL中的”#”后面跟随的字符id在文中找不到，就会有两种情况：如果是在当前页面，除了URL地址变化了，其它的不会改变，页面不会有跳转；如果是从其它页面跳转过来，则页面会在顶部显示，”#”基本就是聋子的耳朵——摆设。

3.JQuery下锚点的平滑跳转

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对于锚点的平滑跳转，在一般的商业性质的网站上，权衡来说，要谨慎使用。

例如：让页面平滑滚动到一个id为box的元素处，则JQuery代码只要一句话，如下：

$(“html,body”).animate({scrollTop:$(“#box”).offset().top},1000)

其中animate为JQuery的自定义动画方法，$(“#box”).offset().top表示id为box的JQuery对象距离页面顶部的偏移值，1000表示平滑动画执行的时间为1000毫秒，也就是1秒。

4.IE下锚点刷新失效及JQuery下的解决

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【1】关于锚点刷新失效

锚点刷新失效就是指当按下刷新键F5时，即使此时URL的后面就随锚点，此锚点也是不起作用的。

【2】在JQuery中，不难实现。可以根据URL获取锚点，从而进一步获得对应锚点对象，然后再让页面的滚动高度为其距离页面顶部的偏移值就可以了。使得页面无论是重新载入还是其刷新，其后面的锚点都起作用。

其js代码如下：

	
			$(function(){
		<div class="line number2 index1 alt1" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">var url = window.location.toString();</code></div>

		<div class="line number3 index2 alt2" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">var id = url.split(&ldquo;#&rdquo;)[</code><code class="java value" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: #009900 !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">1</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">];</code></div>

		<div class="line number4 index3 alt1" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;</code><code class="java keyword" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: #006699 !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; FONT-WEIGHT: bold !important; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">if</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">(id){</code></div>

		<div class="line number5 index4 alt2" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">var t = $(&ldquo;#&rdquo;+id).offset().top;</code></div>

		<div class="line number6 index5 alt1" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">$(window).scrollTop(t);</code></div>

		<div class="line number7 index6 alt2" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java spaces" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">&nbsp;&nbsp;&nbsp;</code><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">}</code></div>

		<div class="line number8 index7 alt1" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; BACKGROUND-COLOR: white !important; MARGIN: 0px; PADDING-LEFT: 0em !important; WIDTH: auto !important; PADDING-RIGHT: 1em !important; FLOAT: none !important; HEIGHT: auto !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px"><code class="java plain" style="BACKGROUND-IMAGE: none !important; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px !important; LINE-HEIGHT: 1.2em !important; MARGIN: 0px; PADDING-LEFT: 0px !important; WIDTH: auto !important; PADDING-RIGHT: 0px !important; FONT-FAMILY: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; FLOAT: none !important; HEIGHT: auto !important; COLOR: black !important; FONT-SIZE: 1em !important; VERTICAL-ALIGN: baseline !important; OVERFLOW: visible !important; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px">});</code></div>
		</div>
		</td>
	</tr>
</tbody>