How to define two functions in javascript

The first way: It can be called before the definition of function or it can be called after functionAfter definitionCall:

(0) Function call

##

add(1,2) //可以调用

(1) Function definition:

##

function add(x,y) {
       console.log(x+y) ;
    }

(2) Function call

add(1,2)//可以调用

The second way: the function can only be called after the

function is defined.

(1) Definition of function

##

var add2=function (ax,ay) {
        alert(ax+ay) ;
    }

(2) Function call

 add2(1,2)

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