Function that returns a value
In the function in the previous section, the results are output through "document.write". What if you want to process the results of the function?
We only need to change the "document.write(sum)" line to the following code:
function add2(x,y)
{
sum = x + y;
return sum; //返回函數(shù)值,return后面的值叫做返回值。}You can also store the return value of the calling function through variables, the code is as follows:
result = add2(3,4);//語(yǔ)句執(zhí)行后,result變量中的值為7。
Note: The parameters and return values ??in the function are not just numbers, but can also be other types such as strings
