单文件js

// about.js
function Index (){
	if(!(this instanceof Index)){
		return new Index();
	}
	this.init();
};
Index.prototype = {
	init: function (){
		this.getUserName();
	},
	getUserName: function (){
		console.log(this, "江湖再见");
	}
};
$(document).ready(function (){
	// new Index();
	Index();
});