perf/index-ko.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <script src="//cdn.bootcss.com/knockout/3.4.0/knockout-debug.js"></script>
</head>
<body>

    <table border="1">
        <thead>
            <tr>
                <td>name</td>
                <td>age</td>
                <td>sex</td>
            </tr>
        </thead>
        <tbody data-bind="foreach:data">
            <tr>
                <td data-bind="text:name,attr:{algin: 'left'}"></td>
                <td data-bind="text:age, attr:{algin: 'right'}"> </td>
                <td data-bind="text:sex, attr:{algin: 'left'}"> </td>
            </tr>
        </tbody>
    </table>


    <script>
        var vm = {
            data: ko.observableArray([])
        };

        ko.applyBindings(vm);
        var sexMap = {
            'true': "男",
            'false': "女"
        };
        function genData(n) {
            var ret = []
            for (var i = 0; i < n; i++) {
                ret.push({
                    name: Math.random(),
                    age: 3 + Math.ceil((Math.random() * 30)),
                    sex: sexMap[1 - Math.random() > 0.5],
                    desc: Math.random()
                })
            }
            return ret
        }

        var time = 0;
        var array = [];
        var id = setInterval(function () {
            var temp = genData(1000);
            var t1 = Date.now()
            vm.data(temp);

            var cost = Date.now() - t1
            array.push(cost)

            console.log('total ' + (cost) + ' ms', time++)
            if (array.length > 60) {
                console.log('平均耗时 ' + (array.reduce(function (a, b) {
                    return a + b
                }, 0)) / array.length + ' ms!!!')
                array.shift()
                console.log('更新平均耗时 ' + (array.reduce(function (a, b) {
                    return a + b
                }, 0)) / array.length + ' ms!!!')
                clearInterval(id)
            }
        }, 50)

    </script>
</body>

</html>