c#中字符串显示上标和下标解决办法
时间：2016-05-21 23:08:31
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由于工作的需求，需要在word中插入带入带有上标和下标的字符串，比如这样的一个字符串：SO?²?(mg/L)。在网上搜了好久，终是摸索出点思路。
解决办法：使用转义字符加Unicode的HexEntity就可以实现了。比如定义一个SO?²?(mg/L)这样的字符串如下："SO\x2084\x00B2\x207B(mg/L)"。其中x2084为 ?（注意：此处为4的下标） 的Unicode HexEntity，x00B2为 ²（注意：此处为2的上标） 的Unicode HexEntity，x207B为 ?（注意：此处为-的上标） 的Unicode HexEntity。
一些常用字符如下：
Common Arithmetic & Alebgra
|
Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| LESS THAN | < | < | < | < |
| GREATER THAN | > | > | > | > |
| LESS THAN OR EQUAL TO | ≤ | ≤ | ≤ | ≤ |
| GREATER THAN OR EQUAL TO | ≥ | ≥ | ≥ | ≥ |
| PLUS OR MINUS | ± | ± | ± | ± |
| NOT EQUALS | ≠ | ≠ | ≠ | ≠ |
| DIVISION SIGN | ÷ | ÷ | ÷ | ÷ |
| TIMES X | × | × | × | × |
| MINUS | − | − | − | − |
| DIVISION SLASH | ∕ | -- | ∕ | ∕ |
| FRACTION SLASH | ⁄ | &frasl | ⁄ | ⁄ |
| SQUARE ROOT RADICAL | √ | √ | √ | √ |
| CUBE ROOT | ? | -- | ∛ | ∛ |
| FOURTH ROOT | ? | -- | ∜ | ∜ |
| INFINITY | ∞ | ∞ | ∞ | ∞ |
| ALEF INFINITY SYMBOL | ℵ | ℵ | ℵ | ℵ |
| FUNCTION ITALIC F | ƒ | ƒ | ƒ | ƒ |
| PRIME (single quote) | ′ | ′ | ′ | ′ |
| DOUBLE PRIME (double quote) | ″ | ″ | ″ | ″ |
| TRIPLE PRIME (triple quote) | ? | -- | ‴ | ‴ |
| THEREFORE (Triangular Dots) | ∴ | ∴ | ∴ | ∴ |
| DOT OPERATOR | ⋅ | ⋅ | ⋅ | ⋅ |
| SUPERSCRIPT TWO | ¹ | ¹ | ¹ | ¹ |
| SUPERSCRIPT TWO | ² | ² | ² | ² |
| SUPERSCRIPT THREE | ³ | ³ | ³ | ³ |
| LEFT ANGLE BRACKET | 〈 | ⟨ | 〈 | 〈 |
| RIGHT ANGLE BRACKET | 〉 | ⟩ | 〉 | 〉 |
| LEFT CEILING BRACKET | ⌈ | ⌈ | ⌈ | ⌈ |
| RIGHT CEILING BRACKET | ⌉ | ⌉ | ⌉ | ⌉ |
| LEFT FLOOR BRACKET | ⌊ | ⌈ | ⌊ | ⌊ |
| RIGHT FLOOR BRACKET | ⌋ | ⌉ | ⌋ | ⌋ |
| CIRCLED PLUS (Direct Sum) | ⊕ | ⊕ | ⊕ | ⊕ |
| CIRCLED TIMES (Vector Product) | ⊗ | ⊗ | ⊗ | ⊗ |
Superscript Chart（上标）
| Character Name | Character | Num Entity | Hex Entity |
|---|---|---|---|
| SUPERSCRIPT ZERO | ? | ⁰ | ⁰ |
| SUPERSCRIPT ONE Entity Code = ¹ |
¹ | ¹ | ¹ |
| SUPERSCRIPT TWO Entity Code = ² |
² | ² | ² |
| SUPERSCRIPT THREE Entity Code = ³ |
³ | ³ | ³ |
| SUPERSCRIPT FOUR | ? | ⁴ | ⁴ |
| SUPERSCRIPT FIVE | ? | ⁵ | ⁵ |
| SUPERSCRIPT SIX | ? | ⁶ | ⁶ |
| SUPERSCRIPT SEVEN | ? | ⁷ | ⁷ |
| SUPERSCRIPT EIGHT | ? | ⁸ | ⁸ |
| SUPERSCRIPT NINE | ? | ⁹ | ⁹ |
| SUPERSCRIPT PLUS SIGN | ? | ⁺ | ⁺ |
| SUPERSCRIPT MINUS | ? | ⁻ | ⁻ |
| SUPERSCRIPT EQUALS SIGN | ? | ⁼ | ⁼ |
| SUPERSCRIPT LEFT PARENTHESIS | ? | ⁽ | ⁽ |
| SUPERSCRIPT RIGHT PARENTHESIS | ? | ⁾ | ⁾ |
| SUPERSCRIPT LATIN SMALL LETTER I | ? | ⁱ | ⁱ |
| SUPERSCRIPT LATIN SMALL LETTER N | ? | ⁿ | ⁿ |
Subscript Codes（下标）
| Character Name | Character | Num Entity | Hex Entity |
|---|---|---|---|
| SUBSCRIPT ZERO | ? | ₀ | ₀ |
| SUBSCRIPT ONE | ? | ₁ | ₁ |
| SUBSCRIPT TWO | ? | ₂ | ₂ |
| SUBSCRIPT THREE | ? | ₃ | ₃ |
| SUBSCRIPT FOUR | ? | ₄ | ₄ |
| SUBSCRIPT FIVE | ? | ₅ | ₅ |
| SUBSCRIPT SIX | ? | ₆ | ₆ |
| SUBSCRIPT SEVEN | ? | ₇ | ₇ |
| SUBSCRIPT EIGHT | ? | ₈ | ₈ |
| SUBSCRIPT NINE | ? | ₉ | ₉ |
| SUBSCRIPT PLUS SIGN | ? | ₊ | ₊ |
| SUBSCRIPT MINUS | ? | ₋ | ₋ |
| SUBSCRIPT EQUALS SIGN | ? | ₌ | ₌ |
| SUBSCRIPT LEFT PARENTHESIS | ? | ₍ | ₍ |
| SUBSCRIPT RIGHT PARENTHESIS | ? | ₎ | ₎ |
| LATIN SUBSCRIPT SMALL LETTER A | ? | ₐ | ₐ |
| LATIN SUBSCRIPT SMALL LETTER E | ? | ₑ | ₑ |
| LATIN SUBSCRIPT SMALL LETTER O | ? | ₒ | ₒ |
| LATIN SUBSCRIPT SMALL LETTER I | ? | ᵢ | ᵢ |
| LATIN SUBSCRIPT SMALL LETTER R | ? | ᵣ | ᵣ |
| LATIN SUBSCRIPT SMALL LETTER U | ? | ᵤ | ᵤ |
| LATIN SUBSCRIPT SMALL LETTER V | ? | ᵥ | ᵥ |
| LATIN SUBSCRIPT SMALL LETTER X | ? | ₓ | ₓ |
| GREEK SUBSCRIPT SMALL LETTER BETA | ? | ᵦ | ᵦ |
| GREEK SUBSCRIPT SMALL LETTER GAMMA | ? | ᵧ | ᵧ |
| GREEK SUBSCRIPT SMALL LETTER RHO | ? | ᵨ | ᵨ |
| GREEK SUBSCRIPT SMALL LETTER PHI | ? | ᵩ | ᵩ |
| GREEK SUBSCRIPT SMALL LETTER CHI | ? | ᵪ | ᵪ |
Superscript and Subscript
Check these references for other methods to implement superscript/subscript and extra fractions
Fractions
These codes display fractions set to be all within one line with smaller number, but they can be replaced by other ways of typing a fraction (e.g. "1/2").
-- means no HTML entity code exists and that a numeric code must be used.
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| VULGAR FRACTION 1/4 | ¼ | ¼ | ¼ | ¼ |
| VULGAR FRACTION 1/2 | ½ | ½ | ½ | ½ |
| VULGAR FRACTION 3/4 | ¾ | ¾ | ¾ | ¾ |
| VULGAR FRACTION 1/3 | ? | -- | ⅓ | ⅓ |
| VULGAR FRACTION 2/3 | ? | -- | ⅔ | ⅔ |
| VULGAR FRACTION 1/5 | ? | -- | ⅕ | ⅕ |
| VULGAR FRACTION 2/5 | ? | -- | ₢ | ⅖ |
| VULGAR FRACTION 3/5 | ? | -- | ⅗ | ⅗ |
| VULGAR FRACTION 4/5 | ? | -- | ⅘ | ⅘ |
| VULGAR FRACTION 1/6 | ? | -- | ⅙ | ⅙ |
| VULGAR FRACTION 5/6 | ? | -- | ⅚ | ⅚ |
| VULGAR FRACTION 1/8 | ? | -- | ⅛ | ⅛ |
| VULGAR FRACTION 3/8 | ? | -- | ⅜ | ⅜ |
| VULGAR FRACTION 5/8 | ? | -- | ⅝ | ⅝ |
| VULGAR FRACTION 7/8 | ? | -- | ₖ | ⅞ |
Common Statistics
-- means no HTML entity code exists and that a numeric code must be used.
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| LOWER CASE MU (Mean) | μ | μ | μ | μ |
| LOWER CASE SIGMA (Standard Deviation) | σ | σ | σ | σ |
| LOWER CASE CHI | χ | χ | χ | χ |
| CAPITAL PI N-ARY PRODUCT | ∏ | ∏ | ∑ | ∑ |
| N-ARY COPRODUCT (upside down capital pi) | ? | -- | ∐ | ∐ |
X-Bar, P-Hat and D-Bar
Some codes like that for x? (X-bar) are actually a combination of two codes - the base letter x plus a code for the line above (̄: or ?). Capital letter may need to be reduced in size to accomodate the placement of the combining diacritic.
Note on Safari: These symbols use combining characters and may not be correctly Safari 2 or other older browsers.
| Character Name | Character | HTML Code |
|---|---|---|
| X-Bar (Average) | x? | x̄ |
| P-Hat | p? | p̂ |
| D-Bar | D? | <span style="font-size:80%">D</span>̄ |
Measurement Symbols
Common Symbols
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| DEGREE SYMBOL | ° | ° | ° | ° |
| MICRO MU SYMBOL | µ | µ | µ | µ |
| SINGLE PRIME (feet, degree minutes) | ′ | ′ | ′ | ߰ |
| DOUBLE PRIME (feet, degree minutes) | ″ | ″ |
′ | ߰ |
| PER MILLE (1/1000th) | ‰ | ‰ | ‰ | ߮ |
Calculus
Common Calculus Entity Codes
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| INTEGRAL | ∫ | ∫ | ∫ | ∫ |
| PARTIAL DIFFERENTIAL | ∂ | ∂ | ∂ | ࢚ |
| INCREMENT (Difference or capital Delta) | Δ | Δ | ∆ | ∆ |
| NABLA (Backward Difference, Grad or upside down triangle) | ∇ | ∇ | ∇ | ∇ |
Additional Integral Symbols
These symbols have numeric entity codes only.
| Character Name | Character | Num Entity | Hex Entity |
|---|---|---|---|
| DOUBLE INTEGRAL | ? | ∬ | ∬ |
| TRIPLE INTEGRAL | ? | ∭ | ∭ |
| QUADRUPLE INTEGRAL | ? | ⨌ | ⨌ |
| CONTOUR INTEGRAL | ∮ | ∮ | ∮ |
| SURFACE INTEGRAL | ? | ∯ | ∯ |
| VOLUME INTEGRAL | ? | ∰ | ∰ |
| CLOCKWISE INTEGRAL | ? | ∱ | ∱ |
| ANTICCLOCKWISE INTEGRAL | ? | ⨑ | ⨑ |
| CLOCKWISE CONTOUR INTEGRAL | ? | ∲ | ∲ |
| ANTICLOCKWISE CONTOUR INTEGRAL | ? | ∳ | ∳ |
Letter Symbols
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| INFINITY (Sideways 8) | ∞ | ∞ | ∞ | ∞ |
| ALEF INFINITY SYMBOL | ℵ | ℵ | ℵ | ℵ |
| WEIERSTRASS POWER SET (Script Capital P) | ℘ | ℘ | ℘ | ℘ |
| IMAGINARY NUMBER (Blackletter I) | ℑ | ℑ | ′ | ′ |
| REAL NUMBER (Blackletter I) | ℜ | ℜ |
′ | ′ |
| DOUBLE-STRUCK REAL NUMBER (Double R) | ? | -- | ℝ | ℝ |
| COMPLEX NUMBERS (Double C) | ? | -- | ℂ | ℂ |
| NATURAL NUMBERS (Double N) | ? | -- | ℕ | ℕ |
| PRIME NUMBERS (Double P) | ? | -- | ℙ | ℙ |
| RATIONAL NUMBERS (Double Q) | ? | -- | ℚ | ℚ |
| INTEGERS (Double Z) | ? | -- | ℤ | ℤ |
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| FOR ALL (Upside-down A) | ∀ | ∀ | ∀ | ∀ |
| COMPLEMENT (Thin C) | ? | -- | ∁ | ∁ |
| THERE EXISTS (Backwards E) | ∃ | ∃ | ∃ | ∃ |
| THERE DOES NOT EXIST (Backwards E with slash) | ? | -- | ∄ | ∄ |
| EMPTY SET (O slash) | ∅ | ∅ | ∅ | ∅ |
| NOT SYMBOL (Corner) | ¬ | ¬ | ¬ | ¬ |
| TILDE (Alternate Not Symbol) | ˜ | ˜ | -- | -- |
| LOGICAL AND (Wedge or Upside down V Symbol) | ∧ | ∧ | ∧ | ∧ |
| LOGICAL OR (V Symbol) | ∨ | ∨ | ∨ | ∨ |
| XOR | ? | -- | ⊻ | ⊻ |
| NAND | ? | -- | ⊼ | ⊼ |
| NOR | ? | -- | ⊽ | ⊽ |
| INTERSECTION (Cap or Upside Down U) | ∩ | ∩ | ∩ | ∩ |
| UNION (Cup or U Symbol) | ∪ | ∪ | ∪ | ∪ |
| ELEMENT OF | ∈ | ∈ | ∈ | ∈ |
| NOT AN ELEMENT OF | ∉ | ∉ | ∉ | ∉ |
| SMALL ELEMENT OF | ? | -- | ∊ | ∊ |
| CONTAINS AS MEMBER | ∋ | ∋ | ∋ | ∋ |
| DOES NOT CONTAIN AS MEMBER | ? | -- | ∌ | ∌ |
| SMALL CONTAINS AS MEMBER | ? | -- | ∍ | ∍ |
| SET MINUS | ? | -- | ∖ | ∖ |
| SUBSET OF (Sideways U with cap to left) | ⊂ | ⊂ | ⊂ | ⊂ |
| SUPERSET OF (Sideways U with cap to right) | ⊃ | ⊃ | ⊃ | ⊃ |
| NOT A SUBSET OF (Subset with Slash) | ⊄ | ⊄ | ⊄ | ⊄ |
| NOT A SUPERSET OF (Superset with slash) | ? | -- | ⊅ | ⊅ |
| SUBSET OF OR EQUAL TO (Subset with line below) | ⊆ | ⊆ | ⊆ | ⊆ |
| SUPERSET OF OR EQUAL TO (Superset with line below) | ⊇ | ⊇ | ⊇ | ⊇ |
| NEITHER A SUBSET OF NOR EQUAL TO | ? | -- | ⊈ | ⊈ |
| NEITHER A SUPERSET OF NOR EQUAL TO | ? | -- | ⊉ | ⊉ |
| SUBSET OF WITH NOT EQUAL TO | ? | -- | ⊊ | ⊊ |
| SUPERSET OF WITH NOT EQUAL TO | ? | -- | ⊋ | ⊋ |
| DIAMOND OPERATOR (Possibility) |
? | -- | ⋄ | ⋄ |
| ASYMPTOTICALLY EQUAL TO One to one Correspondence |
? | -- | ≃ | ≃ |
| NOT ASYMPTOTICALLY EQUAL TO | ? | -- | ≄ | ≄ |
| MULTISET (U with arrow) | ? | -- | ⊌ | ⊌ |
| MULTISET MULTIPLICATION (U with dot in center) | ? | -- | ⊍ | ⊍ |
| MULTISET UNION (U with plus in center) | ? | -- | ⊎ | ⊎ |
| DOUBLE SUBSET | ? | -- | ⋐ | ⋐ |
| DOUBLE SUPERSET | ? | -- | ⋑ | ⋑ |
| DOUBLE INTERSECTION | ? | -- | ⋒ | ⋒ |
| DOUBLE UNION | ? | -- | ⋓ | ⋓ |
| N-ARY LOGICAL AND | ? | -- | ⋀ | ⋀ |
| N-ARY LOGICAL OR | ? | -- | ⋁ | ⋁ |
| N-ARY INTERSECTION&cu | ? | -- | ⋂ | ⋂ |
| N-ARY UNION | ? | -- | ⋃ | ⋃ |
| CURLY LOGICAL OR | ? | -- | ⋎ | ⋎ |
| CURLY LOGICAL AND | ? | -- | ⋏ | ⋏ |
| CIRCLED PLUS (Direct Sum) | ⊕ | ⊕ | ⊕ | ⊕ |
| CIRCLED TIMES (Vector Product) | ⊗ | ⊗ | ⊗ | ⊗ |
| CIRCLED MINUS | ? | -- | ⊖ | ⊖ |
| CIRCLED DIVISION SLASH | ? | -- | ⊘ | ⊘ |
Other Element Of Symbols
| ELEMENT OF WITH LONG HORIZONTAL STROKE | ? | ⋲ | ⋲ |
| ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE | ? | ⋳ | ⋳ |
| SMALL ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE | ? | ⋴ | ⋴ |
| ELEMENT OF WITH DOT ABOVE | ? | ⋵ | ⋵ |
| ELEMENT OF WITH OVERBAR | ? | ⋶ | ⋶ |
| SMALL ELEMENT OF WITH OVERBAR | ? | ⋷ | ⋷ |
| ELEMENT OF WITH UNDERBAR | ? | ⋸ | ⋸ |
| ELEMENT OF WITH TWO HORIZONTAL STROKES | ? | ⋹ | ⋹ |
| CONTAINS WITH LONG HORIZONTAL STROKE | ? | ⋺ | ⋺ |
| CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE | ? | ⋻ | ⋻ |
| SMALL CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKE | ? | ⋼ | ⋼ |
| CONTAINS WITH OVERBAR | ? | ⋽ | ⋽ |
| SMALL CONTAINS WITH OVERBAR | ? | ⋾ | ⋾ |
| NOTATION BAG MEMBERSHIP | ? | ⋿ | ⋿ |
Geometric Symbols
Note: The entity code for the Angle Symbol (∠) is ∠ and the code for the perpendicular angle (⊥) is⊥.
Otherwise, these symbols have numeric codes only.
Angles and Lines
| Character Name | Character | Num Entity | Hex Entity |
|---|---|---|---|
| RIGHT ANGLE | ∟ | ∟ | ∟ |
| ANGLE Entity Code = ∠ |
∠ | ∠ | ∠ |
| MEASURED ANGLE | ? | ∡ | ∡ |
| SPHERICAL ANGLE | ? | ∢ | ∢ |
| DIVIDES | ∣ | ∣ | ∣ |
| DOES NOT DIVIDE | ? | ∤ | ∤ |
| PARALLEL TO | ∥ | ∥ | ∥ |
| NOT PARALLEL TO | ? | ∦ | ∦ |
| RIGHT ANGLE WITH ARC | ? | ⊾ | ⊾ |
| RIGHT TRIANGLE | ⊿ | ⊿ | ⊿ |
| UP TACK (Perpendicular) Entity Code = ⊥ |
⊥ | ⊥ | ⊥ |
| RIGHT TACK | ? | ⊢ | ⊢ |
| LEFT TACK | ? | ⊣ | ⊣ |
| DOWN TACK | ? | ⊤ | ⊤ |
Logical Proofs
Note: The entity code for the Therefore Symbol (∴) is ∴. Otherwise, these symbols have numeric codes only.
| Character Name | Character | Num Entity | Hex Entity |
|---|---|---|---|
| THEREFORE (Triangular Dots) Entity Code = ∴ |
∴ | ∴ | ∴ |
| BECAUSE (Upside down Triangular Dots) | ∵ | ∵ | ∵ |
| PROPORTIONAL TO Entity Code = ∝ |
∝ | ∝ | ∝ |
| END OF PROOF (solid rectangle) | ? | ∎ | ∎ |
Common Equivalence and Proportion Operators
Common Equivalence Operators
| Character Name | Character | Entity | Num Entity | Hex Entity |
|---|---|---|---|---|
| NOT EQUALS | ≠ | ≠ | ≠ | ≠ |
| APPROXIMATELY EQUAL | ≅ | ≅ | ≅ | ≅ |
| ALMOST EQUAL (ASYMPTOTIC) | ≈ | ≈ | ≈ | ≈ |
| NOT ALMOST EQUAL TO | ? | -- | ≉ | ≉ |
| TILDE SIMILAR TO | ∼ | ∼ | ∼ | ∼ |
| IDENTICAL TO (three lines) | ≡ | ≡ | ≡ | ≡ |
| NOT IDENTICAL TO | ? | -- | ≢ | ≢ |
Other Equivalence Symbols
| STRICTLY EQUIVALENT TO | ? | ≣ | ≣ |
| NOT IDENTICAL TO | ? | ≢ | ≢ |
| LESS-THAN OVER EQUAL TO | ≦ | ≦ | ≦ |
| GREATER-THAN OVER EQUAL TO | ≧ | ≧ | ≧ |
| LESS-THAN BUT NOT EQUAL TO | ? | ≨ | ≨ |
| GREATER-THAN BUT NOT EQUAL TO | ? | ≩ | ≩ |
| MUCH LESS-THAN | ? | ≪ | ≪ |
| MUCH GREATER-THAN | ? | ≫ | ≫ |
| BETWEEN | ? | ≬ | ≬ |
| NOT EQUIVALENT TO | ? | ≭ | ≭ |
| NOT LESS-THAN | ≮ | ≮ | ≮ |
| NOT GREATER-THAN | ≯ | ≯ | ≯ |
| NEITHER LESS-THAN NOR EQUAL TO | ? | ≰ | ≰ |
| NEITHER GREATER-THAN NOR EQUAL TO | ? | ≱ | ≱ |
| LESS-THAN OR EQUIVALENT TO | ? | ≲ | ≲ |
| GREATER-THAN OR EQUIVALENT TO | ? | ≳ | ≳ |
| NEITHER LESS-THAN NOR EQUIVALENT TO | ? | ≴ | ≴ |
| NEITHER GREATER-THAN NOR EQUIVALENT TO | ? | ≵ | ≵ |
| LESS-THAN OR GREATER-THAN | ? | ≶ | ≶ |
| GREATER-THAN OR LESS-THAN | ? | ≷ | ≷ |
| NEITHER LESS-THAN NOR GREATERTHAN | ? | ≸ | ≸ |
| NEITHER GREATER-THAN NOR LESSTHAN | ? | ≹ | ≹ |
| NOT TILDE | ? | ≁ | ≁ |
| MINUS TILDE | ? | ≂ | ≂ |
| ASYMPTOTICALLY EQUAL TO | ? | ≃ | ≃ |
| NOT ASYMPTOTICALLY EQUAL TO | ? | ≄ | ≄ |
| APPROXIMATELY BUT NOT ACTUALLY EQUAL TO | ? | ≆ | ≆ |
| NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO | ? | ≇ | ≇ |
| NOT ALMOST EQUAL TO | ? | ≉ | ≉ |
| ALMOST EQUAL OR EQUAL TO | ? | ≊ | ≊ |
| TRIPLE TILDE | ? | ≋ | ≋ |
| ALL EQUAL TO | ≌ | ≌ | ≌ |
原文地址：http://blog.csdn.net/snowdust/article/details/5895593
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