js单例模式

function Sequence(){ window.singleSequence;//这样定义很不友好，没找到好的方法，所以先这样了 if (window.singleSequence === undefined) { window.singleSequence = (function createGenerator(){ // 缓存单例的变量 var instance; function next(){ if (instance === undefined) { instance = new Construct(); } return instance.start++; } function Construct(){ this.start =1; } return { next: next }})(); } return window.singleSequence;}

转载于:https://www.cnblogs.com/dehuachenyunfei/p/10442577.html