r, n, rn 的区别_html/css_WEB-ITnose
\n 是换行,英文是 New line,表示使光标到行首\r 是回车,英文是 Carriage return,表示使光标下移一格\r\n 表示回车换行
我们在平时使用电脑时,已经习惯了回车和换行一次搞定,敲一个回车键,即是回车,又是换行
1、\n 软回车:
在Windows 中表示换行且回到下一行的最开始位置。相当于Mac OS 里的 \r 的效果在Linux、unix 中只表示换行,但不会回到下一行的开始位置
2、\r 软空格:
在Linux、unix 中表示返回到当行的最开始位置在Mac OS 中表示换行且返回到下一行的最开始位置,相当于Windows 里的 \n 的效果
3、\t 跳格(移至下一列)
它们在双引号或定界符表示的字符串中有效,在单引号表示的字符串中无效。
\r\n 一般一起用,用来表示键盘上的回车键,也可只用 \n\t 表示键盘上的“TAB”键
就像你使用 enter和shift+enter的区别
4、文件中的换行符号:
Linux,unix: \r\nWindows : \nMac OS : \r
5、常用转义符号的意义:
\n LF或ASCII中的0x0A(10)\r CR或ASCII中的0x0D(13)\t 水平制表符-HT或ASCII中的0x09(9)\\ 反斜杠\$ 美圆符\" 双引号\' 单引号
6、\r\n 与
的区别
\r\n是输出的HTML代码换行,客户看到的效果没有换行如果是输出给浏览器,就用 <br />
\r\n 好比你在 DreamWeaver 里做一个网页,在源代码里按一下回车,是给源代码回车换行。是输出一个(HTML标记性语言),在HTML中解释为输入的字换行\r\n 的作用是给源代码回车换行,输入后,查看 html 源代码,就看会到有换行,而 HTML 解释器(浏览器)认为它是没用的东西,用不用都一样显示
原文地址: http://m.studyofnet.com/news/285.html

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