重写函数让其无限相加

//貘大
function add(x) {
    var c = 0; 
    return function(x) {
        c = c + x ; arguments.callee.toString = function(){
            return c;
        }; 
        return arguments.callee;
    }(x);
}; 
alert(add(2)(3)(4)); 

//司徒正美
function add (a){
                if(!isFinite(add.i)){
                    add.i = a
                }else {
                    add.i += a;
                }
                add.valueOf = add.toString = function(){
                    return add.i
                }
                return add;
            }
            alert(add(2)(3)(4))

重写函数让其无限相加

一个使用闭包，一个使用函数作为中介存储结果

转自http://www.cnblogs.com/rubylouvre/archive/2012/02/15/2351991.html