how to detect a function was called with javascript

Question

I have a javascript function.

How to check:

• if function was called ( in section have this function), then not

Answer 1

You can use a global variable in a custom namespace to store whether the function has been called.

if(!window.mynamespace){
    window.mynamespace={};
}

mynamespace.callMeOnlyOnce=function(){

    if(mynamespace.alreadyCalled)return;

    alert('calling for the first time');
    mynamespace.alreadyCalled=true;
};

// alert box comes
mynamespace.callMeOnlyOnce();


// no alert box
mynamespace.callMeOnlyOnce();