!DOCTYPE html html head meta charsetUTF-8 title/title /head body /body script /*function:自定义函数关键字*/ function jiecheng(a){ var res1; for(var i1;ia;i){ res*i; } return res; } document.write(jiecheng(10));//10的阶乘 /script /html 10的阶乘
!DOCTYPE html html head meta charsetUTF-8 title/title /head body /body script /*function:自定义函数关键字*/ function jiecheng(a){ var res1; for(var i1;ia;i){ res*i; } return res; } document.write(jiecheng(10));//10的阶乘 /script /html