Edit in JSFiddle

var demo1Model =function(){
  var self =this;
    self.Click=function(){
        alert("viewModel Click event!");
    };
};


ko.applyBindings(new demo1Model() ,document.getElementById("Demo1"));

<h1>演示 KnockOut click绑定  功能</h1>
<hr />
<ul>
     <li  class="Point">
    1、<b  class="PointTitle">click绑定到<span class="KeyWord">处理函数</span></b><br />
      
        <div  class="PointDemo" id="Demo1">
            <h1>绑定到viewModel方法</h1>
            <button data-bind="click: Click" >点击触发viewModel方法</button>
                    </div>
        <hr />
    </li>
</ul>

/*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;
}