HTML 方法:<span class="space"></span> Unicode 方法: " " space (U+0020) " " en space (U+2002) " " em space (U+2003) " " three-per-em space (U+2004) " " four-per-em space (U+2005) " " six-per-em space (U+2006) " " figure space (U+2007) " " punctuation space (U+2008) " " thin space (U+2009) " " hair space (U+200A) "" zero width space (U+200B) " " medium mathematical space (U+205F)