<string>
使用规则
<string>
数据类型是由包含在英文双引号("
)或英文单引号(')中的任意数量的Unicode字符组成。
大多数字符都可以写成字面量的形式,并且所有字符都可以写成以反斜线(\
)开头的十六进制Unicode码点的形式。比如说:\22
表示一个双引号,\27
表示一个单引号,\A9
表示版权声明符号(©
)。
需要注意的是,在使用某些特殊字符时需要在前面加上反斜线来转义,包括但不限于在双引号字符串中使用双引号字符,在单引号字符串中使用单引号字符,以及反斜线字符,比如\\
表示一个反斜线字符。
当你想换行的时候,必须使用像\A
或者\00000A
这样的换行符。不过在你的代码中,可以通过在每行末尾增加一个反斜线(\
)的方式来创建一个多行的字符串。
注意: CSS<string>
中不能使用像
或者—
这样的实体。
例子
/* Simple strings */ "This string is demarkated by double quotes." 'This string is demarkated by single quotes.' /* Character escaping */ "This is a string with \" an escaped double quote." "This string also has \22 an escaped double quote." 'This is a string with \' an escaped single quote.' 'This string also has \27 an escaped single quote.' "This is a string with \\ an escaped backslash." /* New line in a string */ "This string has a \Aline break in it." /* String spanning two lines of code (these two strings will have identical output) */ "A really long \ awesome string" "A really long awesome string"
规范
Specification | Status | Comment |
---|---|---|
CSS Values and Units Module Level 3 <string> |
Candidate Recommendation | No significant change from CSS Level 2 (Revision 1). |
CSS Level 2 (Revision 1) <string> |
Recommendation | Explicit definition; allows 6-digit Unicode escaped characters. |
CSS Level 1 <string> |
Recommendation | Implicit definition; allows 4-digit Unicode escaped characters. |
浏览器兼容性
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
Find out how you can help! (en-US)
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 1.0 | 1.0 (1.0) | (Yes) | (Yes) | 1.0 (85) |
\xx | 1.0 | 1.0 (1.0) | 6.0 | (Yes) | 1.0 (85) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
\xx | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |