js单例模式

//js 的单例模式<h2>用代理实现单例模式</h2><p>示例：创建为一个div</p><script>  var CreateDiv = function(html){       this.html = html;       this.init();}CreateDiv.prototype.init = function(){     var div = document.createElement("div");     div.innerHTML = htis.html;     document.body.appendChild(div);}//接下来引入代理类var ProxySingletonCreateDiv = (function(){        var instance;    return function(html){         if(!instance){             instance = new CreateDiv(html);         }         return instance;}  }())new ProxySingletonCreateDiv("夏玲")；</script>