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字符含义\uparrow↑\downarrow↓\Uparrow⇑\Downarrow⇓\updownarrow↕\Updownarrow⇕\rightarrow→\leftarrow←\Rightarrow⇒\Leftarrow⇐\leftrightarrow↔\Leftrightarrow⇔\longrightarrow⟶\longleftarrow⟵\Longrightarrow⟹\Longleftarrow⟸\mapsto↦\longmapsto⟼\hookleftarrow↩\hookrightarrow↪\leftharpoonup↼\rightharpoonup⇀\leftharpoondown↽\rightharpoondown⇁\rightleftharpoons⇌\leadsto⇝\nearrow↗\searrow↘\swarrow↙\nwarrow↖\nleftarrow↚\nrightarrow↛\nLeftarrow⇍\nRightarrow⇏\nleftrightarrow↮\nLeftrightarrow⇎\dashrightarrow⇢\dashleftarrow⇠\leftleftarrows⇇\leftrightarrows⇆\Lleftarrow⇚\twoheadleftarrow↞\leftarrowtail↢\looparrowleft↫\leftrightharpoons⇋\curvearrowleft↶\circlearrowleft↺\Lsh↰\upharpoonleft↿\downharpoonleft⇃\upuparrows⇈\multimap⊸\leftrightsquigarrow↭\rightrightarrows⇉\rightleftarrows⇄\twoheadrightarrow↠\rightarrowtail↣\looparrowright↬\rightleftharpoons⇌\curvearrowright↷\circlearrowright↻\Rsh↱\downdownarrows⇊\upharpoonright↾\downharpoonright⇂\rightsquigarrow⇝
而如果想在箭头上面写字的话
X\stackrel{F}{\longrightarrow}Y
X
⟶
F
Y
X\stackrel{F}{\longrightarrow}Y
X⟶FY
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