Knockout.js Style绑定

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="js/jquery-1.11.1.min.js"></script>
    <script src="js/knockout-3.3.0.js"></script>
    <script type="text/javascript">
        var viewModel = {
            currentProfit: ko.observable(1)
        };
        $(function () {
            viewModel.currentProfit(-1);
            ko.applyBindings(viewModel);
        })
    </script>
</head>
<body>
    <div data-bind="style: { color: currentProfit() < 0 ? 'red' : 'black' }">
        Profit Information
    </div>
</body>

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