原型实例

function Fruits() {}        Fruits.prototype = {            color: ‘red‘,            say: function(num1, num2) {                return ‘i am ‘ + this.color + num1 + ‘ and ‘ + num2;            }        };        var apple = new Fruits();        alert(apple.say(1,2));        banana = {            color:‘yellow‘        };

alert(Fruits.prototype.say.call(banana, [1, 2]));//        alert(Fruits.prototype.say.apply(banana, [1, 2]));

会有出错，call的【1，2】被解析为字符串1，2放入num1，而num2为undefined;