JavaScript参数，意外的数字错误

Question

When parsing the following argument the console.log states that the two numbers (arguments) are unexpected. Why is this and how could I fix this error?

function max(20, 20) {
 return width * height;
}
console.log(max(width, height));

Answer 1

It should be this way (your arguments cannot be direct values, it should be variables. And while calling them you should use values)

function max(width, height) {
 return width * height; 
}
console.log(max(20,20));

Answer 2

You don't have to pass values as arguments in definition of function, but when you'll call it, so your code should be like example bellow.

Hope this helps.

---

 //Definition function max(width , height) { return width * height; } //Call console.log(max(20, 20)); 

Answer 3

When you define a function you tell the function the arguments you are going to use ,it is something like defining a variable to use it inside the function.You can't define number as arguments.Try to do it like this:

 function max(width , height) 
{
     return width * height;
}
console.log(max(20, 20));

and pass the numbers you want ,when you use the function ,not when you define it.

Answer 4

Note the changes:

function max(width, height) //pass 20 to both width and height by calling function this way->> max(20,20);.
       {
       return width * height; 
       } 
       console.log(max(width, height));  
      //printing width and height

Now,why is function max(20,20) wrong?

• Whatever goes inside a function paranthesis(argument) should be a variable declaration(or name of a predefined variable) ,it can not be a value. You had entered 20,20 and 20 is not treated as a variable because variable names cannot begin with a number in javascript and almost all other languages.
• That is the reason you are getting an error.

Well,I know that you are confused because you have seen stuff like max(20,20); . Haven't you? This is called calling the function and passing value to it . I guess this is what you wanted to do.

• max(20,20); is a statement in which you are calling the function max . Here (20,20) is valid beacuse you can enter value as well because these values are supposed to be passed to width and height .