knockoutjs关键点

<p>Your value: <input data-bind="value: someValue, valueUpdate: 'afterkeydown'"/></p>
<p>You have typed: <span data-bind="text: someValue"></span></p>

someValue: ko.observable("edit me")

部分实例：

<div data-bind="html:details"></div>
<div data-bind="css: { profitWarning: currentProfit() < 0 }">100万 </div>
<div data-bind="style: { color: currentProfit() < 0 ? 'red' : 'black' }">
<a data-bind="attr: { href: url, title: details2 }"> Report</a>
Profit Information
</div>
You've clicked <span data-bind="text: numberOfClicks"></span> times
<button data-bind="click: incrementClickCounter">Click me</button>
<div>
<div data-bind="event: { mouseover: enableDetails, mouseout: disableDetails }"> Mouse over me </div>
<div data-bind="visible: detailsEnabled"> Details </div>
</div>
<input data-bind="value: someModelProperty" />
<p> <input type='checkbox' data-bind="checked: hasCellphone"/> I have a cellphone</p>
<p> Your cellphone number: <input type='text' data-bind="value: cellphoneNumber, enable: hasCellphone"/></p>
<p>Your value: <input data-bind="value: someValue, valueUpdate: 'afterkeydown'"/></p>
<p>You have typed: <span data-bind="text: someValue"></span></p>

<script type="text/javascript" src="jquery-1.9.1.js"></script>
<script type="text/javascript" src="knockout-v2.2.1.js"></script>

<script type="text/javascript">

var myviewModel = {
details: ko.observable(),
currentProfit: ko.observable(150000),
url: ko.observable("year-end.html"),
details2: ko.observable("Report including final year-end statistics"),
numberOfClicks: ko.observable(0),
incrementClickCounter: function () {
var previousCount = this.numberOfClicks();
this.numberOfClicks(previousCount + 1);
},
detailsEnabled: ko.observable(false),
enableDetails: function () {
this.detailsEnabled(true);
},
disableDetails: function () {
this.detailsEnabled(false);
},
someModelProperty:ko.observable(""),
hasCellphone: ko.observable(false),
cellphoneNumber: ko.observable(""),
someValue: ko.observable("edit me")

};
ko.applyBindings(myviewModel);
myviewModel.details("<em>For further details, view the report <a href='report.html'>here</a>.</em>");
myviewModel.currentProfit(-50);

</script>