方括号（[]）在JavaScript正则表达式中的作用是什么？
据我的知识（[]）用于Knockout.js，它用于定义observableArray。请在下面找到示例和链接。
// This observable array initially contains three objects
var anotherObservableArray = ko.observableArray([
{ name: "Bungle", type: "Bear" },
{ name: "George", type: "Hippo" },
{ name: "Zippy", type: "Unknown" }
]);http://knockoutjs.com/documentation/observableArrays.html