文档：

        http://www.ruanyifeng.com/blog/2019/04/weekly-issue-52.html(软件-通过url生成图表的开源服务)

        https://quickchart.io/

demo:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <img id="bar" src="" />
    <script>
        window.onload = function() {
            var obj = {
                type: 'bar',
                data: {
                    labels: ['January', 'February', 'March', 'April', 'May'],
                    datasets: [{
                        label: 'Dogs',
                        data: [50, 60, 70, 180, 190]
                    }, {
                        label: 'Cats',
                        data: [100, 200, 300, 400, 500]
                    }, {
                        label: 'Cats',
                        data: [100, 200, 300, 400, 500]
                    }, {
                        label: 'Cats',
                        data: [100, 200, 300, 400, 500]
                    }]
                }
            };
            document.getElementById("bar").src = `https://quickchart.io/chart?width=500&height=300&c=${JSON.stringify(obj)}`
        }
    </script>

</body>

</html>