函数柯里化

curry.js

function Foo(x, y, z, w) {
    var args = arguments;
    if (args.length < Foo.length) {
        return function() {
            var oldArgs = Array.prototype.slice.call(args);
            var newArgs = oldArgs.concat(Array.prototype.slice.call(arguments));
            return args.callee.apply(null,newArgs);
        }
    } else {
        return x + y - z * w;
    }
}
console.log( Foo(1,4,3,2) ); //-1
console.log( Foo(1)(4)(3)(2) ); //-1
console.log( Foo(1,4)(3)(2) ); //-1