prototype中的bind方法

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<script type="text/javascript" src="prototype_mini.js" ></script><script>var Cat = Class.create();Cat.prototype = {initialize:function(name){this.name = name;},show:function(){alert('show!!!');}}var Dog = Class.create();Dog.prototype = {initialize:function(name){this.name = name;},run:function(){alert("run!!!");}}var cat1 = new Cat("cat1");cat1.show();var dog1 = new Dog();run1 = dog1.run.bind(cat1);run1();show2 = cat1.show.bind(dog1);show2();function a(a,b){alert("a method invoked!!!"+(a+b));}function c(){}function b(){var a = 0;}var b1 = new b();a.apply(b1,[1,2]);//b1继承了a的所有方法和属性c.call(b1,1,2);//这样也能调用？</script>