var singleton = (function(){
var instance;
return function () {
if (instance) return instance;
instance = this;
return instance;
}
}());
var obj = new singleton();
var obj2 = new singleton();
console.log(obj2 === obj); // true
var printer =
(function() {
var printerInstance;
function create() {
function print() {}
function turnOn(){}
return {
print: print,
turnOn: turnOn
};
}
function Singleton() {
if (!
printerInstance) {
printerInstance =
create();
}
return printerInstance;
}
return {
getInstance: Singleton();
};
}());
转载于:https://www.cnblogs.com/ax-null/p/6789316.html
相关资源：JavaScript 设计模式学习 Singleton
