问题提出

对于一个输入框， 如果其id中含有冒号(:)，选择器使用需要有特殊写法，

例如 id为下

<input type="text" value="ddd" id="a:b">

使用$(selector)直接使用#id值, 找不到DOM

console.log("#a:b")
console.log($("#a:b").length) // output 0

经过探索可以使用以下两个方法选择到DOM:

$("#a\\:b");

$("[id^='a:b']");

其中第一种， 需要在冒号（：）前添加一个反斜杠（\）, 某些同学要问了，命名是两个反斜杠， 忽悠我？

请看下节介绍。

JS转义

js中的字符串语法需要占用一些元字符， 对于这些元字符如果需要想要在字符串中出现就需要使用转移：

转义表： FROM http://www.w3school.com.cn/js/js_special_characters.asp

事实上，从上表中看以看出，不仅仅是元字符需要显示才转义（" -> \"）， 还有使用转移后可以将特定字符转义为另外含义的情况， 例如 n -> \n 变为换行符。

从学习上可以按照如下逻辑整体理解js转义：

1、 js字符串使用 单引号 或者 双引号 作为字符串的”括号”， 表示一个整体字符串， 引号内部为字符串内容，

2、 那么问题来了， 字符串内容中要想包括 引号， 怎么办？

3、 js设计者（Brendan Eich）考虑， 类似c语言中转义方法， 使用\x 方式来表示x， 即转义规则 \x == x， 这里x包括引号（‘ “）。

4、 既然使用了\x格式执行转义， 那字符串内容中要想包含\怎么办？ 如果直接使用\, 则很可能跟其后面一个正常字符意外的转义。

5、 既然转义规则已定  \x == x， 那么\在字符串内容中存在的场景，正符合此规则， 规则应用效果为 \\ == \ 、

6、 最后还有一种场景， 存在很多控制字符（包括格式控制字符，例如\n、 和不可打印字符）， 这些字符本身没有可打印字符的表现形式，即没有在ascii中[32, 126]出现。

但是字符只能书写[32, 126]之间的字符， 所以这种情况下需要定义一种新的转义， 为不增加转义元字符， 转义字符还为\,

转义规则为 \x == y,  x in [32, 126], y in [0, 31] or 127

说明： 如果对[32, 126]之间的非3 和 6中使用字符进行转义，即应用规则（\x）， 则得到还是x， 符合转义规则。

总结如下图：

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RL4h/8ART//ACgW/wDjRRQAf8Il8Q/+in/+UC3/AMaP+ES+If8A0U//AMoFv/jRRQAf8Il8Q/8Aop//AJQLf/Gj/hEviH/0U/8A8oFv/jRRQAf8Il8Q/wDop/8A5QLf/Gj/AIRL4h/9FP8A/KBb/wCNFFAB/wAIl8Q/+in/APlAt/8AGj/hEviH/wBFP/8AKBb/AONFFAB/wiXxD/6Kf/5QLf8Axqx4c8EazpnjKTxLrnin+2rptPNgo/s9LbanmCQfcbBwQe3frxRRQB//2Q==" alt="" />

demo代码：

            console.log('---- \\x present x (x is printable character) ----');

            console.log('slash + slash='+"\\"); // \ is part of transfer encoding syntax

            console.log('slash + "='+"\""); // " is collision with string syntax double quotation, eg "xx" wrapped by "

            console.log('---- \\x present control character ----');

            console.log('slash + n='+"\n"); // \n present line break

            console.log('---- \\x equal x when x is not needed transfer concoding ----');

            console.log('slash + 8='+"\8"); // \8 == 8

            console.log('slash + o='+"\o"); // \o == o

            console.log('slash + :='+"\:"); // \: == :

JQuery执行顺序跟踪

经过分析JQuery源代码， $("")的调用次序

1、 $ === jQuery.fn.init

2、 走到 jQuery.fn.init 中  return ( context || rootjQuery ).find( selector );

3、 find == jQuery.find == Sizzle

4、Sizzle 调用 newContext.querySelectorAll( newSelector )

而 querySelectorAll 为 最新浏览器都实现的 选择器查询接口，

各个DOM上都实现了 此接口， 详情见 http://www.cnblogs.com/snandy/archive/2011/03/30/1999388.html

所以查看到这里， 说明jquery 和 sizzle 未对选择器做处理。完全是 浏览器实现 的 querySelectorAll接口行为。

CSS Selector规则

W3C对选择器有一套规范：

http://www.w3.org/TR/css3-selectors/#selectors

其中有对 id选择器的说明， 可见选择器的中 : 为选择器的元字符， 即保留字符， 做伪类使用，其他情况不能与之冲突。

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" alt="" />

所以读到此处，看官明白 $("#a\\:b"); 为什么要对冒号添加转义了吧！

对于此选择器 即 "#a\\:b"  由于其本身是js字符串， \\表示\, 那么这个字符串在内存中的存储为

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAARkAAABFCAIAAADxSQV4AAAFtElEQVR4nO1c3bGzOgykLgqiHqpJL2d4TxvcB3L5nBgLW7LsdbI7mTM5toUWWYt/IEz7z+Pv+aQtbe22k9rN18AS61/DEDndy/ZCS71ya4h4/ThGjFU7Lf09n/zww4/9U3lcoi1tPTDE+VZeL/WKtQVD9BNt8W259zBGP/247RCgljhvoW0dW66XeK0twK+dbxE4LjE/CsBYCaCWmB8FYKwEUEtcL9G2ji3XSz9quyz/SsLvcUn43dVWqPp7PnVOq3DOxDdoaVn+2RZF2dX29gjG/DDm1lE+TdPxN0aD2stwOTnVsaqmJUVvNbC9BGBa4HMTbMMjONXK4fJwamGVg5v1EmwefJ4GZFqAc5ODfJQ71ab8+lGysMrEjZZg86AoEF3SApzbGfzLIyimFfm1Kb/Hv6netzi1sMpH7riUqhV8e+foR2OotEDmds6lzwaNIfuFYlVzvYSWBylAdYCijQdSfqmlfL819/GgTqxi+1qglhSglpqCWrLj1i8mMUxWWUfwdqADtWQHtVQEaknZvhZu/VbZIFLg1i8gMXkfrxerfLze97Dv+/nlwOsn7F1zNOZzUg3Lu6dF+BRCzNl+48JCL/Z7RrI7MZxY7VG4wnwTELbR7+P5QeG3e1oI6JUcKb/h3gMUsQNHSBvSeSF13Sk4QlwU2iPnaAjMtDiAFsP4eTwQYh0ppVxX3seDzdEQgGkRNgAc2wGJDb9eyvEBmKNxY6i0CAG7L4JJDJNV1hGEOvAcDYHcAbDcMImpWD2WaV43R1ZZR/B2oEOpX2Seam7bOlsSJOX3G5978NISn3toB99xySYmasnOCkRL2zovj9ffYlBL+74bxSRryTSB39Z5mjT96rX38FimeV2Xw1YRshQrDC2ZpFTmV5sWj1fsj84rp2n/zcUt1GLK56ZZCRu0JPvVUnosZxc+FpWaKmyzOew9vKWo5krR4V7tts6q3Mjxa+L2WNQ5e+vXmDpqyH5V92rDOd5jUencHg2vPfHHMq/b668Cre7VhrrXUM3xa+skvZh8RW6Az7h0dp/yuug7Lu2WHJ3Xbd/WRTnbL/WrCkQ4G1AuXt3HJYOY5OceAG94WNdLhnGpxXqpPA8uZnjeFwnDXPSkptFSg/XSi1p5BAW/FfbxbOsl2a+KVdB9yime8z6eOg9s+w6t7tVu6/zWAco53q1ffcq+oByZUn6/VEumuXrKb/99PONiSeFXx3Nb5/+HzkU3x2uiJaWYbv3aiengoKUKsPv1yAO7lHh/6R0qMVFLRcDUUgVQS+/QiIlaKgK1pGxfC7d+AbfLvnEfz4tV//WSHUV+AdMiboZzG4e/BbzEpWuNluK3KQC+RyH1vgeEVxeEfD649UqOKXqnQsiqO7H9KlZnV3Zk9cFHtsp938MOeem6RPe0EAAbQ0BiaONSEZyee7Ci1C9gWoQNAOefgMQA10tF8Hoez4gWzz2YkekXds2JSQyTVdYRhDrwHA2B3AFo3L7xt4AVcOn35/bxFO1rgVpSgFpqCmrJDmqpCNSSsn0tjKilA/JEOiypXpvyK+89WJxaWOVjyDz4AGBaDMTtbPmBBrUtKVlYZUK/99A3Dy5NoNICn5tgGx7BqVYOl4dTC6sc5O6JC8x65ejbaUCmBSa38BmiXRy14lpv21TV+QxhqdNanHNwv16CyoMUdFH2rpXb2PPDbhu2jG3j7662QlX4NFmR0yqcM3H/DNGl71RtG9v4UB/XntiRUOtke3sEY34Yc0sH2gqQtKTorQa2lxgi1l+AXzvfInTYo0MD8yMfjJUAaon5UQDGSgC11C0/RpyX0lbAzd6Dq2/a0rYBqCXa0nYwW87xuAYowBA53QtT/Lv2viV74jUAHyWXjS9N5MapQvmY31GCw+S2BIHDbQnneGNc80DAOAuglmhL2zq21BJtaVvHFkhLvTBEP9EW35ZaGpJzLzBWAv4DXXaV+P1wrr8AAAAASUVORK5CYII=" alt="" />

可以猜测 querySelectorAll 的实现， 首先会同js对selector字符串 做解析， 首先分析 ： 前面不带\ 的冒号， 将其前后内容拆分， 前面为 选择器主体部分， 后面为伪类部分，

然后对 前面主题部分， 执行js字符串转义解析， 类似eval接口执行行为 :

eval("var evalselector = '#a\\:b';")
console.log(evalselector); // output  #a:b

将 aaarticlea/png;base64,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" alt="" />转义表写 还原为 aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAADMAAAA5CAIAAAAUWIQbAAABO0lEQVRoge1ZXQ6DIAzuuXYgzrPT7C7L3r0GeyARqKUCXWvN+GKM2B8+m5aiQozxvW1xFnq2oOpdYgvTfnu8S7CYjcN3niWNEPLd8vp4p7zWs61iFkIEgHQ+wkCKY5YHbePShZIUoWJGckehVpJyMdufiXQxl0mdUnLeKs92DWOQ8y5mLJrMeA0D3JYZX5t6OKnNdPDrmTa5EKpOiivAnlZrXrpvGkPUA7Rp0XmWBz5rs6VhgBv2AO/MRBXweT4AwmuGVlcFzK8aAmateYndtj2ku209NGP2gzwT01LbbcvyTHPVUGLGaxhgMRuHZg8QoKs2Pa5n6bi8B+D3gB3uYlaKfeVZHviszZaGARazcZz0AI/fHJHS+raNpQi4O5EBZ6R6tjf5hzKB9X9zHP/KzG+eLWZjtlfmGW/7BTWdCSJiV6qgAAAAAElFTkSuQmCC" alt="" />

运行如下js：

console.log("#a:b")

console.log("#a\:b")

console.log(document.querySelectorAll("#a\\:b").length)

console.log("[id^='a:b']")

console.log(document.querySelectorAll("[id^='a:b']").length)

打印如下：

aaarticlea/png;base64,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" alt="" />

结论 ：

1、冒号（:）属于js中不用转义的普通可见字符， "#a:b" === "#a\:b"

2、 "#a\\:b" 为避免css selector伪类标识符号冲突的解法， 经过 js字符串转义，需要两个反斜杠\， 最后在 querySelectorAll接口中，将\:转换为：

3、 对于id中含有冒号的情况， 可以使用"[id^='a:b']"的表写方式， 这种不需要对冒号转义， 因为这种格式不存在冲突的可能。

建议 id可变的情况，都使用"[id^='a:b']"方式。

demo code

<html>

<head>

        <script type="text/javascript" src="./jquery.js"></script>

        <style>

        </style>

</head>

<body>

        <input type="text" value="ddd" id="a:b">

        <script>

            console.log('---- \\x present x (x is printable character) ----');

            console.log('slash + slash='+"\\"); // \ is part of transfer encoding syntax

            console.log('slash + "='+"\""); // " is collision with string syntax double quotation, eg "xx" wrapped by "

            console.log('---- \\x present control character ----');

            console.log('slash + n='+"\n"); // \n present line break

            console.log('---- \\x equal x when x is not needed transfer concoding ----');

            console.log('slash + 8='+"\8"); // \8 == 8

            console.log('slash + o='+"\o"); // \o == o

            console.log('slash + :='+"\:"); // \: == :

            console.log('#a+slash+slash+:b='+"#a\\:b"); // #a\\:b == #a\:b

            console.log('jquery length='+$("#a\\:b").length); // length == 1 with selector #a\\:b

            console.log('jquery length='+$("[id^='a:b']").length); // length == 1 with selector [id^='a:b']

            console.log("#a:b") //output #a:b

            console.log("#a\:b") //output #a:b

            console.log(document.querySelectorAll("#a\\:b").length)//output 1

            console.log("[id^='a:b']") //: do not need transfer coding

            console.log(document.querySelectorAll("[id^='a:b']").length) //output 1

        </script>

</body>

</html>