Function.prototype.js

/**
 * Function.prototype.bind
 */
if (!isFunc(Function.prototype.bind)){
    Function.prototype.bind = function(thisArg){
        if(!isFunc(this)){
            throw new TypeError("Bind must be called on a function")
        }

        var slice = [].slice,
            self = this,
            bindArgs = slice.call(arguments, 1),
            newFunc = function(){
                self.apply(
                    this instanceof newFunc ? this : (thisArg || {}),
                    bindArgs.concat(slice.call(arguments))
                )
            };

        newFunc.prototype = self.prototype;

        return newFunc
    }
}