javaScript.objCacheFn.js - use object to cache unique and related functions, with the key-value structure similar to array in PHP.

javaScript.objCacheFn.js

var store = {
    nextId: 1,
    cache: {},
    add: function (fn) {
        if (!fn.id) {
            fn.id = this.nextId;
            this.nextId += 1;
            return !!(this.cache[fn.id] = fn);
        }
    }
}

var testFn = function (xxx) {
    console.log('just for test' + xxx);
}
store.add(testFn);

console.dir(store.cache);