Web Front-endH5 Tutorial\9 and \0 may hack IE11\IE9\IE8 Detailed explanation of the invalid reasons
每次设计一张网页或一个表单，都被各种浏览器的兼容问题伤透脑筋，尤其是IE家族。在做兼容性设计时，我们往往会使用各种浏览器能识别的独特语法进行hack，从而达到各种浏览器下显示正常的目的。其中，我们用得最多莫属于\9和\0了。\9和\0是hack IE8、IE9、IE11的独特标识。但是问题来了，\9和\0到底怎样hack IE8、IE9、IE11这三个浏览器？这个问题一直困扰我很久，不过，今天我终于搞明白了，也独创了一个能hack IE8、IE9、IE11这三个浏览器的代码写法模式，本文将与各位分享。
\9和\0为什么可能hack IE11\IE9\IE8无效？
可能很多人都略明白，\0是用来hack IE8、IE9、IE11的，而\9是用来hack IE9的。但有时你真正运用起来，它并不凑效。看下面的html代码：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#0000FF\0; /* 蓝色 */
background-color:#FFFF00\9; /* 黄色 */
}
</style>
</head>
<body>
<div class="content">IE8 IE9 IE11均显示黄色</div>
</body>
</html>上例中，\9和\0就达不到hack 各IE浏览器版本的目的。不过我们把 /* 蓝色 */ 和 /* 黄色 */ 这两行调换，又会怎样显示呢？请看html代码：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#FFFF00\9; /* 黄色 */
background-color:#0000FF\0; /* 蓝色 */
}
</style>
</head>
<body>
<div class="content">IE11显示黄色，IE8 IE9 均显示蓝色</div>
</body>
</html>结果是，IE11显示黄色，而IE8和IE9均显示蓝色。
上述两个例子说明，IE8、IE9都能读懂\9和\0标识，此两标识哪个写在后面就以哪个为准，而IE11仅能读懂\9标识。
至此，我们能否根据上述结论来写代码来hack IE8、IE9和IE11三个浏览器？显然是不可以的，至少你不可以hackIE8和IE9，仅能hackIE11。
如何hack IE8和IE9
那么，我们如何去hack IE8和IE9呢？这个就是问题的关键。
在此文 css区分ie8/ie9/ie10/ie11 chrome firefox的代码 中提到，IE9以上浏览器可以读懂此代码：
/* IE9+ */
@media all and (min-width:0) {
.divContent{
background-color:#eee;
}
}我们用此代码结合前面的代码，是不是就可以hack IE8和IE11了？完整html代码如下：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#FFFF00\9; /* 黄色 */
background-color:#0000FF\0; /* 蓝色 */
}
/* IE9+ */
@media all and (min-width:0) {
.content{
background-color:#000; /* 黑色 */
}
}
</style>
</head>
<body>
<div class="content">IE11显示黄色，IE8 显示蓝色，IE9显示黑色。</div>
</body>
</html>至此，IE8、IE9、IE11的兼容性问题就解决了。
不过，还没玩，因为 @media all and (min-width:0) 在 Chrome、Firefox、360等浏览器同样有效。所以，上面代码需要稍微修改下，在 @media all and (min-width:0) {} 里面的css语句同样加上\0标识，表示这是属于IE9的样式。修改后的完整代码如下：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#FFFF00\9; /* 黄色 */
background-color:#0000FF\0; /* 蓝色 */
}
/* IE9+ */
@media all and (min-width:0) {
.content{
background-color:#000\0; /* 黑色 */
}
}
</style>
</head>
<body>
<div class="content">IE11显示黄色，IE8 显示蓝色，IE9显示黑色。</div>
</body>
</html>至此，IE8、IE9、IE11的兼容性问题就完美解决了。
meta声明属性 IE=Edeg 后，IE8\IE9\IE11的兼容代码
但是，如果网页HTML代码里声明了Meta元件 IE=Edge，那么上面的代码是不对的。
先看第一个html代码：
<!DOCTYPE html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#0000FF\0; /* 蓝色 */
background-color:#FFFF00\9; /* 黄色 */
}
</style>
</head>
<body>
<div class="content">IE11显示蓝色，IE8 IE9均显示黄色</div>
</body>
</html>结果是，IE11显示蓝色，IE8 IE9均显示黄色，并非三个浏览器都显示黄色了。
这就说明，加了meta IE=Edge 这句，IE11不再能读\9这个标识。
我们再看如下代码：
<!DOCTYPE html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#FFFF00\9; /* 黄色 */
background-color:#0000FF\0; /* 蓝色 */
}
</style>
</head>
<body>
<div class="content">IE8 IE9 IE11 均显示蓝色</div>
</body>
</html>execcodegetcode
结果是，IE8 IE9 IE11 均显示蓝色，这说明了，IE8 IE9 IE11 均能读懂\0这个标识。
结合上面两个例子，可以得出结论，加了meta IE=Edge 属性后，IE8 IE9能同时读懂\9和\0这两个标识，而IE11仅能读懂\0这个标识。
所以，我们可以据此来hack出IE11。如下html代码加以说明：
<!DOCTYPE html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#0000FF\0; /* 蓝色 这个是给IE11的 */
background-color:#FFFF00\9; /* 黄色 这个是给IE8和IE9的 */
}
</style>
</head>
<body>
<div class="content">IE11显示蓝色，IE8 IE9均显示黄色</div>
</body>
</html>这样，我们再用上面的代码hack出IE8和IE9就可以了。
如何hack IE8和IE9 ？还是前面那个hack IE8 IE9的关键代码：
@media all and (min-width:0) {}
完整html代码这样写：
<!DOCTYPE html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>hack IE8/IE9/IE11_css实例_卡卡网 webkaka.com</title>
<style type="text/css">
.content{
width:400px;height:50px;color:#ccc;
background-color:#FF0000; /* 红色 */
background-color:#0000FF\0; /* 蓝色 这个是给IE11的 */
background-color:#FFFF00\9; /* 黄色 这个是给IE8和IE9的 */
}
/* IE9+ */
@media all and (min-width:0) {
.content{
background-color:#000\9; /* 黑色 这个是给IE9的 */
}
}
</style>
</head>
<body>
<div class="content">IE11显示蓝色，IE8显示黄色，IE9显示黑色</div>
</body>
</html>The above is the detailed content of \9 and \0 may hack IE11\IE9\IE8 Detailed explanation of the invalid reasons. For more information, please follow other related articles on the PHP Chinese website!
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