function ClassA() {
}
ClassA.prototype.color = "blue";
ClassA.prototype.sayColor = function () {
alert(this.color);
};
function ClassB() {
}
ClassB.prototype = new ClassA();
如果写成以下方式,会有什么问题?
function ClassA() {
this.color = "blue";
this.sayColor = function(){
alert(this.color);
}
}
function ClassB() {
}
ClassB.prototype = new ClassA();