Edit in JSFiddle

var ObservableListModel=function() {
    var self = this;

    self.people = ko.observableArray([
        { name: 'Bert' },
        { name: 'Charles' },
        { name: 'Denise' }
    ]);

    self.addPerson = function() {
        self.people.push({ name: "New at " + new Date() });
    };//添加一个对象到数组

    self.removePerson = function() {
        self.people.remove(this);
    };//数组中移除一个对象
};


ko.applyBindings(new ObservableListModel(), document.getElementById("Demo2"));

<h1>演示 KnockOut control flow</h1>
<hr />
<ul>
    <li  class="Point">
        2、<b  class="PointTitle">foreach绑定<span class="KeyWord">obserable array</span></b><br />
        <ul class="PointDesc">
            <li>foreach绑定监控数组的时候，数组的元素个数变化会动态更新到UI</li>
        </ul>
        <div  class="PointDemo" id="Demo2">
            <h4>People</h4>
            <ul data-bind="foreach: people">
                <li>
                    Name: <span data-bind="text: name"> </span>
                    <a href="#" data-bind="click: $parent.removePerson">Remove</a>
                </li>
            </ul>
            <button data-bind="click: addPerson">Add</button>
        </div>
        <!--下面写一些特殊的提示信息-->
        <div class="PSFrame">
            $parent关键字是指向当前foreach的item的上一层对象。
        </div>
        <hr />
    </li>
</ul>
<hr />

/*Demo�ļ���ʽ*/
body
{
    background-color: #e3e5d4;
}
/*  ֪ʶ��    */
.Point
{
    margin: 20px,0,0,0;
}
/*  ֪ʶ�����    */
.PointTitle
{
    color:#0d8d0d;
}
/*  �ؼ���    */
.KeyWord
{
    color:Red;
}
/*  ֪ʶ������    */
.PointDesc
{
    font-family: Arial;
    font-size: 15px;
    color:#09acb8;
}
.PointDesc li
{
    margin: 10px,0,0,0;
}
/*  ֪ʶ��Demo���    */
.PointDemo
{
    border-style:double; 
    border-color:#dcd559;
    min-height:100px;
    font-family: Corbel;
    font-size: 20px;
    color: #00174f;
}
/*  ��Ҫ������ʾ����Ϣ���    */
.PSFrame
{
    border-style: dashed; 
    border-color:#78e6ef;
    font-family: Corbel;
    font-size: 20px;
    font-style:italic;
    color: #b86c00;
}
/*  ������ʾ    */
.error {
    color:Red;
    
}
/*  **********************************************************    */
/*��Ҫǿ������ʽ*/
.Notice
{
    font-weight: bold;
    font-family:Bodoni MT Black;
    color: #cd0707;
}

/*  **********************************************************    */
/*�������ʽ*/
input[type="text"]
{
    min-width:250px;
}
select
{
    min-width:400px;
}