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| function Minister(name) {//大臣
this.name=name;
}
Minister.prototype.say=function() {
console.log(this.name+"大王，冤枉啊！");
};
function Emperor() {//大王
this.name="大王";
this.id=Math.random();
// this.instance=null;
}
Emperor.prototype.say=function() {
console.log(this.name+this.id+"滚");
};
// Emperor.getInstance=function() {
// if(!this.instance){
// this.instance=new Emperor();
// }
// return this.instance;
// };
Emperor.getInstance=(function() {
var instance = null;//将instance私有化
return function() {
if(!instance) {//不存在即创建，否则返回
instance=new Emperor();
}
return instance;
}
})();
var minister1=new Minister("张三");
var emperor1=Emperor.getInstance();
var minister2 = new Minister("李四");
var emperor2=Emperor.getInstance();
var minister3 = new Minister("王二麻子");
var emperor3=Emperor.getInstance();
minister1.say();
emperor1.say();
minister2.say(); emperor2.say();
minister3.say(); emperor3.say();
|
