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教程 chartjs tutorial

极地区域图

极地区域图是基于极坐标系绘制的图表，能展示数据在角度和半径上的变化趋势。借助 Chart.js 可以方便地绘制和自定义极地区域图，实现多样化的视觉效果。

js 
(function () {
  const ctx = document.getElementById("polarAreaChart").getContext("2d");
  const polarAreaChart = new Chart(ctx, {
    type: "polarArea",
    data: {
      labels: ["红", "蓝", "黄", "绿", "紫", "橙"],
      datasets: [
        {
          label: "样本数据",
          data: [11, 16, 7, 3, 14, 9],
          backgroundColor: [
            "rgba(255, 99, 132, 0.7)",
            "rgba(54, 162, 235, 0.7)",
            "rgba(255, 206, 86, 0.7)",
            "rgba(75, 192, 192, 0.7)",
            "rgba(153, 102, 255, 0.7)",
            "rgba(255, 159, 64, 0.7)",
          ],
        },
      ],
    },
    options: {
      responsive: true,
      plugins: {
        legend: { display: true },
        tooltip: { enabled: true },
      },
      scales: {
        r: {
          ticks: {
            beginAtZero: true,
          },
        },
      },
    },
  });
})();
在线代码演示
源码 
<!DOCTYPE html>
<html lang="zh">

<head>
<meta charset="UTF-8" />
<title>Chart.js 极地区域图示例</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js&quot;&gt;&lt;/script&gt;
<style>
body {
max-width: 600px;
margin: 2rem auto;
font-family: Arial, sans-serif;
background: #fafafa;
padding: 1rem;
}


canvas {
  background: #fff;
  border: 1px solid #ccc;
  display: block;
  margin: 0 auto;
}



</style>
</head>


<body>
<canvas id="polarAreaChart" width="600" height="600"></canvas>
<script>
(function () {
const ctx = document.getElementById(‘polarAreaChart’).getContext(‘2d’);
new Chart(ctx, {
type: ‘polarArea’,
data: {
labels: [‘红’, ‘蓝’, ‘黄’, ‘绿’, ‘紫’, ‘橙’],
datasets: [{
label: ‘样本数据’,
data: [11, 16, 7, 3, 14, 9],
backgroundColor: [
‘rgba(255, 99, 132, 0.7)’,
‘rgba(54, 162, 235, 0.7)’,
‘rgba(255, 206, 86, 0.7)’,
‘rgba(75, 192, 192, 0.7)’,
‘rgba(153, 102, 255, 0.7)’,
‘rgba(255, 159, 64, 0.7)’
]
}]
},
options: {
responsive: true,
plugins: {
legend: { display: true },
tooltip: { enabled: true }
},
scales: {
r: {
ticks: {
beginAtZero: true
}
}
}
}
});
})();
</script>
</body>


</html>

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