零基础学习WEB前端开发(七)：注释及特殊字符
作者：互联网
一、注释的使用
注释，就是添加一些“废话”，为了便于理解和阅读，但是并不在正式内容中显示或执行
语法：<!-- 注释的内容 -->
<!--这是一段注释。注释不会在浏览器中显示。-->
<p>这是一段普通的段落。</p>
可以使用快捷键进行注释：Ctrl + /
二、特殊字符
例如空格，在程序中敲n个空格，都是显示一个空格。但是可以使用特殊字符来实现。下面的表中是常见的字符，在代码中输入实体名称就行，注意不要丢了英文分号。
常用的特殊字符
| 显示结果 | 描述 | 实体名称 | 实体编号 |
|---|---|---|---|
| 空格 | |   | |
| < | 小于号 | < | < |
| > | 大于号 | > | > |
| & | 和号 | & | & |
| " | 引号 | " | " |
| ' | 撇号 | ' (IE不支持) | ' |
| ￠ | 分 | ¢ | ¢ |
| £ | 镑 | £ | £ |
| ¥ | 人民币/日元 | ¥ | ¥ |
| € | 欧元 | € | € |
| § | 小节 | § | § |
| © | 版权 | © | © |
| ® | 注册商标 | ® | ® |
| ™ | 商标 | ™ | ™ |
| × | 乘号 | × | × |
| ÷ | 除号 | ÷ | ÷ |
附表：特殊字符
HTML 支持的数学符号
| 字符 | 实体编号 | 实体名称 | 描述 |
|---|---|---|---|
| ∀ | ∀ | ∀ | for all |
| ∂ | ∂ | ∂ | part |
| ∃ | ∃ | ∃ | exists |
| ∅ | ∅ | ∅ | empty |
| ∇ | ∇ | ∇ | nabla |
| ∈ | ∈ | ∈ | isin |
| ∉ | ∉ | ∉ | notin |
| ∋ | ∋ | ∋ | ni |
| ∏ | ∏ | ∏ | prod |
| ∑ | ∑ | ∑ | sum |
| − | − | − | minus |
| ∗ | ∗ | ∗ | lowast |
| √ | √ | √ | square root |
| ∝ | ∝ | ∝ | proportional to |
| ∞ | ∞ | ∞ | infinity |
| ∠ | ∠ | ∠ | angle |
| ∧ | ∧ | ∧ | and |
| ∨ | ∨ | ∨ | or |
| ∩ | ∩ | ∩ | cap |
| ∪ | ∪ | ∪ | cup |
| ∫ | ∫ | ∫ | integral |
| ∴ | ∴ | ∴ | therefore |
| ∼ | ∼ | ∼ | similar to |
| ≅ | ≅ | ≅ | congruent to |
| ≈ | ≈ | ≈ | almost equal |
| ≠ | ≠ | ≠ | not equal |
| ≡ | ≡ | ≡ | equivalent |
| ≤ | ≤ | ≤ | less or equal |
| ≥ | ≥ | ≥ | greater or equal |
| ⊂ | ⊂ | ⊂ | subset of |
| ⊃ | ⊃ | ⊃ | superset of |
| ⊄ | ⊄ | ⊄ | not subset of |
| ⊆ | ⊆ | ⊆ | subset or equal |
| ⊇ | ⊇ | ⊇ | superset or equal |
| ⊕ | ⊕ | ⊕ | circled plus |
| ⊗ | ⊗ | ⊗ | circled times |
| ⊥ | ⊥ | ⊥ | perpendicular |
| ⋅ | ⋅ | ⋅ | dot operator |
HTML 支持的希腊字母
| 字符 | 实体编号 | 实体名称 | 描述 |
|---|---|---|---|
| Α | Α | Α | Alpha |
| Β | Β | Β | Beta |
| Γ | Γ | Γ | Gamma |
| Δ | Δ | Δ | Delta |
| Ε | Ε | Ε | Epsilon |
| Ζ | Ζ | Ζ | Zeta |
| Η | Η | Η | Eta |
| Θ | Θ | Θ | Theta |
| Ι | Ι | Ι | Iota |
| Κ | Κ | Κ | Kappa |
| Λ | Λ | Λ | Lambda |
| Μ | Μ | Μ | Mu |
| Ν | Ν | Ν | Nu |
| Ξ | Ξ | Ξ | Xi |
| Ο | Ο | Ο | Omicron |
| Π | Π | Π | Pi |
| Ρ | Ρ | Ρ | Rho |
| undefined | Sigmaf | ||
| Σ | Σ | Σ | Sigma |
| Τ | Τ | Τ | Tau |
| Υ | Υ | Υ | Upsilon |
| Φ | Φ | Φ | Phi |
| Χ | Χ | Χ | Chi |
| Ψ | Ψ | Ψ | Psi |
| Ω | Ω | Ω | Omega |
| α | α | α | alpha |
| β | β | β | beta |
| γ | γ | γ | gamma |
| δ | δ | δ | delta |
| ε | ε | ε | epsilon |
| ζ | ζ | ζ | zeta |
| η | η | η | eta |
| θ | θ | θ | theta |
| ι | ι | ι | iota |
| κ | κ | κ | kappa |
| λ | λ | λ | lambda |
| μ | μ | μ | mu |
| ν | ν | ν | nu |
| ξ | ξ | ξ | xi |
| ο | ο | ο | omicron |
| π | π | π | pi |
| ρ | ρ | ρ | rho |
| ς | ς | ς | sigmaf |
| σ | σ | σ | sigma |
| τ | τ | τ | tau |
| υ | υ | υ | upsilon |
| φ | φ | φ | phi |
| χ | χ | χ | chi |
| ψ | ψ | ψ | psi |
| ω | ω | ω | omega |
| ϑ | ϑ | ϑ | theta symbol |
| ϒ | ϒ | ϒ | upsilon symbol |
| ϖ | ϖ | ϖ | pi symbol |
html支持的其他字符
| 字符 | 实体编号 | 实体名称 | 描述 |
|---|---|---|---|
| Π| Π| Π| capital ligature OE |
| œ | œ | œ | small ligature oe |
| Š | Š | Š | capital S with caron |
| š | š | š | small S with caron |
| Ÿ | Ÿ | Ÿ | capital Y with diaeres |
| ƒ | ƒ | ƒ | f with hook |
| ˆ | ˆ | ˆ | modifier letter circumflex accent |
| ˜ | ˜ | ˜ | small tilde |
|   |   | en space | |
|   |   | em space | |
|   |   | thin space | |
| | ‌ | ‌ | zero width non-joiner |
| | ‍ | ‍ | zero width joiner |
| | ‎ | ‎ | left-to-right mark |
| | ‏ | ‏ | right-to-left mark |
| – | – | – | en dash |
| — | — | — | em dash |
| ' | ‘ | ‘ | left single quotation mark |
| ' | ’ | ’ | right single quotation mark |
| ‚ | ‚ | ‚ | single low-9 quotation mark |
| " | “ | “ | left double quotation mark |
| " | ” | ” | right double quotation mark |
| „ | „ | „ | double low-9 quotation mark |
| † | † | † | dagger |
| ‡ | ‡ | ‡ | double dagger |
| • | • | • | bullet |
| … | … | … | horizontal ellipsis |
| ‰ | ‰ | ‰ | per mille |
| ′ | ′ | ′ | minutes |
| ″ | ″ | ″ | seconds |
| ‹ | ‹ | ‹ | single left angle quotation |
| › | › | › | single right angle quotation |
| ‾ | ‾ | ‾ | overline |
| € | € | € | euro |
| ™ | ™ or ™ | ™ | trademark |
| ← | ← | ← | left arrow |
| ↑ | ↑ | ↑ | up arrow |
| → | → | → | right arrow |
| ↓ | ↓ | ↓ | down arrow |
| ↔ | ↔ | ↔ | left right arrow |
| ↵ | ↵ | ↵ | carriage return arrow |
| ⌈ | ⌈ | ⌈ | left ceiling |
| ⌉ | ⌉ | ⌉ | right ceiling |
| ⌊ | ⌊ | ⌊ | left floor |
| ⌋ | ⌋ | ⌋ | right floor |
| ◊ | ◊ | ◊ | lozenge |
| ♠ | ♠ | ♠ | spade |
| ♣ | ♣ | ♣ | club |
| ♥ | ♥ | ♥ | heart |
| ♦ | ♦ | ♦ | diamond |
标签：WEB,right,mark,&#,arrow,quotation,前端开发,特殊字符,left 来源： https://blog.csdn.net/txr152111/article/details/120924149