javascript - How to add content to function in another file

Question

Test.html calls two js files a.js and b.js:

There is a

in the a.js file

function test(){
    console.log(1);
}

Now I want to add a

to the test function in b.js

console.log(2);

The goal is to output 1 and 2 no matter where test() is called, how to write it

Answer 1

var rawTest = test;
test=function(){
    rawTest();
    console.log(2);
}

//
test();