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   http://www.apache.org/licenses/LICENSE-2.0

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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/esl.js"></script>
        <script src="lib/config.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
            }
        </style>
        <div id="main"></div>
        <button id="random"></button>
        <script>

            require([
                'echarts'
                // 'echarts/chart/pie',
                // 'echarts/component/legend',
                // 'echarts/component/grid',
                // 'echarts/component/tooltip'
            ], function (echarts) {

                var chart = echarts.init(document.getElementById('main'), null, {

                });

                var randomData = function () {
                    return [
                        {value:Math.random().toFixed(3), name:'a'},
                        {value:Math.random().toFixed(3), name:'b'},
                        {value:Math.random().toFixed(3), name:'c'},
                        {value:Math.random().toFixed(3), name:'d'},
                        {value:Math.random().toFixed(3), name:'e'}
                    ];
                }

                var itemStyle = {
                    normal: {
                        // shadowBlur: 10,
                        // shadowOffsetX: 0,
                        // shadowOffsetY: 5,
                        // shadowColor: 'rgba(0, 0, 0, 0.4)'
                    }
                };

                chart.setOption({
                    legend: {
                        data:['a','b','c','d','e']
                    },
                    tooltip: {

                    },
                    series: [{
                        name: 'pie',
                        type: 'pie',
                        stack: 'all',
                        symbol: 'circle',
                        symbolSize: 10,
                        data: randomData(),
                        itemStyle: itemStyle
                    }]
                });

                setInterval(function () {
                    chart.setOption({
                        series: [{
                            name: 'pie',
                            data: randomData()
                        }]
                    })
                }, 1000)
            })

        </script>
    </body>
</html>