//方案一
var SingletonTester = (function () {
//单例方法
function Singleton(args) {
var args = args || {};
this.name = 'SingletonTester'; //方法对外的属性，另外一种方式就是返回对象
this.pointX = args.pointX || 6;
this.pointY = args.pointY || 10;
}
//单例实例
var instance;
//返回对象
return {
name: 'SingletonTester',
getInstance: function (args) {
if (instance === undefined) {
instance = new Singleton(args);
}
return instance;
}
};
})(); //直接执行该方法
//测试
var test = SingletonTester.getInstance({ pointX: 5 });
console.log(test.pointX);
//方案二
function Universe() {
// 判断是否存在实例
if (typeof Universe.instance === 'object') {
return Universe.instance;
}
// 其它内容
this.start_time = 0;
this.bang = "Big";
// 缓存
Universe.instance = this;
// 隐式返回this
}
// 测试
var uni = new Universe();
var uni2 = new Universe();
console.log(uni === uni2); // true
