enable绑定使DOM元素只有在参数值为 true的时候才enabled。在form表单元素input,select,和textarea上非常有用
<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>
<script type="text/javascript">
var viewModel = {
hasCellphone: ko.observable(false),
cellphoneNumber: ""
};
</script>