Chart.jsで遊んでみた

<h2>折れ線グラフも棒グラフも自由自在！</h2>
```chart.html

<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
  </head>

  <body>
    <canvas id="myChart"></canvas>
    <script>
        var ctx = document.getElementById('myChart').getContext('2d');
        var chart = new Chart(ctx, {
            // The type of chart we want to create
            type: 'horizontalBar', //bar 棒グラフ、line 折れ線グラフ、horizontalBar 横の棒グラフ

            // The data for our dataset
            data: {
                labels: ['January', 'February', 'March', 'April', 'May', 'June'],
                datasets: [{
                    label: '@NJ',
                    data: [80, 50, 60, 40, 30, 150],
                    backgroundColor: 'skyblue',
                    borderColor: 'blue',
                    borderWidth: 0,
                    fill: false,
                    pointStyle: 'rect'
                },{
                    label: '@haruka',
                    data: [100, 100, 40, 50, 30, 100],
                    // borderColor: 'blue',
                    // borderWidth: 5,
                    backgroundColor: [
                      'hsla(90, 60%, 60%, 0.3)',
                      'hsla(180, 60%, 60%, 0.3)',
                      'hsla(270, 60%, 60%, 0.3)',
                      'hsla(360, 60%, 60%, 0.3)',
                      'hsla(0, 60%, 60%, 0.3)',
                      'hsla(80, 60%, 60%, 0.3)',
                    ],
                    lineTension: 0,
                    pointStyle: 'triangle'
                }]
            },

            // Configuration options go here
            options: {
              // scales: {
              //   yAxes: [{
              //     ticks: {
              //       // min: 0,
              //       // max:100
              //       suggestedMin: 0,
              //       suggestedMax: 100,
              //       stepSize: 10,
              //       callback: function(value, index, values){
              //         return 'JPY'+ value;
              //         }
              //     }
              //   }]
              // },

              //積み上げ棒グラフ
              scales:{
                xAxes: [{
                  stacked: true
                }],
                yAxes: [{
                  stacked: true
                }]
              },
              title: {
                display: true,
                text: 'Annual Sales',
                fontSize: 18,
                position:'left'
              },
              animation: {
                duration: 0
              },
              legend:{
                // position: 'right'
                // display: false
              }
            }
        });
        var myLineChart = new Chart(ctx, {
            type: type,
            data: data,
            options: options
        });
        </script>
  </body>
</html>
```

結果は以下の図の通り。最初は折れ線グラフで作ったり枠の色変えたり
縦の棒グラフ作ってたりしたから不要なコードも沢山あります。
（//でコメントにしてるよ）
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/598453/50dfc3f3-1b59-6f6d-346e-52f829ef62b2.png)


<h2>折れ線グラフ</h2>

```index.html

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="utf-8">
    <title>my Chart</title>
</head>
<body>
  <canvas id ="my_chart">
    Canvas not supported...
  </canvas>
  <script
  src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>

  <script>
      'use strict';

      var type = 'line';

      var data = {
        labels: [2010, 2011, 2012, 2013],
        datasets: [{
          label: '@haruka',
          data: [120, 130, 140, 150]
        }, {
          label: '@koji',
          data: [180, 200, 150, 300]
        }]
      };
      var options; 
      var ctx = document.getElementById('my_chart').getContext('2d');
      var myChart = new Chart(ctx, {
        type: type,
        data: data,
        options: options
      });
  </script>
</body>
</html> 
```