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Maybe AOP libraries for javascript like meld will help you?

For example:

var timeTook;
var myObject = {
 doSomething: function(a, b) { 
 return a + b;
 }
};
function beforeFunction() {
 timeTook = performance.now();
}
function afterFunction() {
 console.log("It took " + (performance.now() - timeTook));
}
meld.before(myObject, 'doSomething', beforeFunction);
meld.after(myObject, 'doSomething', afterFunction);

See Also this question in SO.

Maybe AOP libraries for javascript like meld will help you?

For example:

var timeTook;
var myObject = {
 doSomething: function(a, b) { 
 return a + b;
 }
};
function beforeFunction() {
 timeTook = performance.now();
}
function afterFunction() {
 console.log("It took " + (performance.now() - timeTook));
}
meld.before(myObject, 'doSomething', beforeFunction);
meld.after(myObject, 'doSomething', afterFunction);

See Also this question in SO.