display:inline、block、inline-block的区别
display:block就是将元素显示为块级元素.
block元素的特点是：
总是在新行上开始；
高度，行高以及顶和底边距都可控制；
宽度缺省是它的容器的100%，除非设定一个宽度
<div>, <p>, <h1>, <form>, <ul> 和 <li>是块元素的例子。
display:inline就是将元素显示为行内元素.
inline元素的特点是：
和其他元素都在一行上；
高，行高及顶和底边距不可改变；
宽度就是它的文字或图片的宽度，不可改变。
<span>, <a>, <label>, <input>, <img>, <strong> 和<em>是inline元素的例子。
inline和block可以控制一个元素的行宽高等特性，需要切换的情况如下：
让一个inline元素从新行开始；
让块元素和其他元素保持在一行上；
控制inline元素的宽度（对导航条特别有用）；
控制inline元素的高度；
无须设定宽度即可为一个块元素设定与文字同宽的背景色。
display:inline-block将对象呈递为内联对象，但是对象的内容作为块对象呈递。旁边的内联对象会被呈递在同一行内，允许空格。
inline-block的元素特点：
将对象呈递为内联对象，但是对象的内容作为块对象呈递。旁边的内联对象会被呈递在同一行内，允许空格。(准确地说，应用此特性的元素呈现为内联对象，周围元素保持在同一行，但可以设置宽度和高度地块元素的属性)
并不是所有浏览器都支持此属性，目前支持的浏览器有：Opera、Safari在IE中对内联元素使用display:inline-
block，IE是不识别的，但使用display:inline-block在IE下会触发layout，从而使内联元素拥有了
display:inline-block属性的表症。从上面的这个分析，也不难理解为什么IE下，对块元素设置display:inline-
block属性无法实现inline-block的效果。这时块元素仅仅是被display:inline-block触发了layout，而它本就是行
布局，所以触发后，块元素依然还是行布局，而不会如Opera中块元素呈递为内联对象。
IE下块元素如何实现display:inline-block的效果？
有两种方法：
1、先使用display:inline-block属性触发块元素，然后再定义display:inline，让块
元素呈递为内联对象（两个display要先后放在两个CSS声明中才有效果，这是IE的一个经典bug，如果先定义了display:inline-
block，然后再将display设回inline或block，layout不会消失）。代码如下（...为省略的其他属性内容）：
div {display:inline-block;...}
div {display:inline;}
2、直接让块元素设置为内联对象呈递（设置属性display:inline），然后触发块元素的layout（如：zoom:1等）。代码如下：
div {display:inline; zoom:1;...}
<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>
<title>display:inline、block、inline-block的区别</title>
</head>
<style>
div, span {
background-color: palevioletred;
margin: 0px;
border: 1px solid #333;
padding: 0px;
height: 52px;
color: #fff;
} .b {
display: block;
} .i {
display: inline;
} .ib {
display: inline-block;
} </style>
<body>
<div class="i">div display:inline</div>
<div class="ib">div display:inline-block</div>
<div class="b">div display:block</div> <span class="i">span display:inline</span>
<span class="b">span display:block</span>
<span class="ib">span display:inline-block</span> </body> 结果：
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