试题

写出输出值

var name='window';
function WhoAmI()
{
    alert(this.name);
}

var myCat={name:'kitty'};
myCat.tellSelf=function()
{
    whoAmI();
};
myCat.WhoAmI=WhoAmI;

var myDog={name:'dog'};
myDog.WhoAmI=WhoAmI;

WhoAmI();
WhoAmI.call(myCat);
myCat.tellSelf();
myCat.WhoAmI();
myDog.WhoAmI.apply(mycat);

View Code

var name='window';
function WhoAmI()
{
    alert(this.name);
}

var myCat={name:'kitty'};
myCat.tellSelf=function()
{
    whoAmI();
};
myCat.WhoAmI=WhoAmI;

var myDog={name:'dog'};
myDog.WhoAmI=WhoAmI;

WhoAmI();
WhoAmI.call(myCat);
myCat.tellSelf();
myCat.WhoAmI();
myDog.WhoAmI.apply(mycat);

2、

var animal={name:'动物'};
function Cat()
{
    this.name='小猫';
}
Cat.prototype=animal;

var myCat=new Cat();

delete myCat.name;
alert(myCat.name);
myCat.name='小明';
alert(myCat.name);
delete myCat.name;
alert(myCat.name);
delete myCat.name;
alert(myCat.name);

delete animal.name;
alert(myCat.name);
animal.name='animal';
alert(myCat.name);

View Code

var animal={name:'动物'};
function Cat()
{
    this.name='小猫';
}
Cat.prototype=animal;

var myCat=new Cat();

delete myCat.name;
alert(myCat.name);
myCat.name='小明';
alert(myCat.name);
delete myCat.name;
alert(myCat.name);
delete myCat.name;
alert(myCat.name);

delete animal.name;
alert(myCat.name);
animal.name='animal';
alert(myCat.name);