请参阅我的代码：

require(["dojo/parser","dijit/layout/BorderContainer","dijit/form/Button","dojo/on","dijit/form/Select","dojo/store/Memory","dojo/request","dojo/domReady!"
],function(parser,BorderContainer,Button,on,Select,Memory,request)
{

var btn4 = new Button // Button,not button
({
    label: "Number of cards",this.set("disabled",false) // This code that disables the button
    },"btn4"); 
btn4.startup();
})

我在Dojo或谷歌找不到帮助.