(

defun

add-two-num

(

num1

num2

)

"This is document of add-two-num"

(

format

t

"This is my first function~%"

)

(

+

num1

num2

)

;;last statement return value,or use return-from in anywhere

)

(

format

t

"sum is ~d"

(

add-two-num

4

5

))

一、概括

在浏览器中HTML文件以HTML DOM（document object model）的形式存储，这给js处理HTML文件带来了方便。