参数是否传递给功能参数？

Question

f2=function(fn){
    return fn
};

f1 = f2(function(a,b){
    console.log('' + a+ b)
    });

f1(3,4);

output is 34

Why are the parameters(3 and 4) passed to f3?

Answer 1

Why are the parameters(3 and 4) passed to f3?

The function returned from f1

f2(function(a,b){
    console.log('' + a+ b)
});

is invoked () with 3 , 4 passed as parameters f1(3,4); , where a is 3 , b is 4