Unicode spaces

http://www.cs.tut.fi/~jkorpela/chars/spaces.html

 

 

Space characters in Unicode Code Name of the character Sample Width of the character

U+0020	SPACE  空格	foo bar	Depends on font, often adjusted (see below)
U+00A0	NO-BREAK SPACE	foo  bar	As a space, but often not adjusted
U+2000	EN QUAD	foo  bar	1 en (= 1/2 em)
U+2001	EM QUAD	foo  bar	1 em (nominally, the height of the font)
U+2002	EN SPACE	foo  bar	1 en (= 1/2 em)
U+2003	EM SPACE	foo  bar	1 em
U+2004	THREE-PER-EM SPACE	foo  bar	1/3 em
U+2005	FOUR-PER-EM SPACE	foo  bar	1/4 em
U+2006	SIX-PER-EM SPACE	foo  bar	1/6 em
U+2007	FIGURE SPACE	foo  bar	“Tabular width”, the width of digits
U+2008	PUNCTUATION SPACE	foo  bar	The width of a period “.”
U+2009	THIN SPACE	foo  bar	1/5 em (or sometimes 1/6 em)
U+200A	HAIR SPACE	foo  bar	Narrower than THIN SPACE
U+200B	ZERO WIDTH SPACE	foo ​bar	Nominally no width, but may expand
U+202F	NARROW NO-BREAK SPACE	foo  bar	Narrower than NO-BREAK SPACE (or SPACE )
U+205F	MEDIUM MATHEMATICAL SPACE	foo  bar	4/18 em
U+3000	IDEOGRAPHIC SPACE	foo 　bar	The width of ideographic (CJK ) characters.
U+FEFF	ZERO WIDTH NO-BREAK SPACE	foo bar	No width (the character is invisible)

 

' ' 相当于\u0020 空格<SP>
'\n' 相当于\u000a 换行<LF>
'\r' 相当于\u000d 回车<CR>
'\t' 相当于\u0009 水平制表符<TAB>
'\f' 相当于\u000c 换页
'\x0b' 垂直制表符<VT>
'\xa0' 相当于\u0160，亦即'&#160;' 就即'&nbsp;' 不断行的空白（1个字符宽度）<NBSP> No-break Space
'\2002'..'\u200a' 定宽空格Fixed width spaces
\u2002即'&ensp;'半个空白（1个字符宽度）
\u2003即'&emsp;'一个空白（2个字符宽度）
'\u200b' 零宽空格Zero-width Space
'\u2028' 行分隔符 <LS> (我们使用word打文章时每行后出现的小符号)
'\u2029' 段落分隔符<PS>（类推）