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教程 chartjs tutorial

柱状图 Bar

柱状图是用来展示不同类别数据比较的常见图表类型。使用 Chart.js 可以方便地绘制多样化的柱状图，实现清晰的数据对比效果。

基础柱状图示例

下面示例展示了如何创建一个响应式的柱状图，包含多彩柱子和图例。

js 
(function () {
  const ctx = document.getElementById("barChart").getContext("2d");
  const barChart = new Chart(ctx, {
    type: "bar",
    data: {
      labels: ["红", "蓝", "黄", "绿", "紫", "橙"],
      datasets: [
        {
          label: "样本数据",
          data: [12, 19, 3, 5, 2, 3],
          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 },
      },
    },
  });
})();
在线代码演示
源码 
<!DOCTYPE html>
<html lang="zh">

<head>
<meta charset="UTF-8" />
<title>Chart.js 柱状图示例</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="barChart" width="600" height="400"></canvas>
<script>
(function () {
const ctx = document.getElementById(‘barChart’).getContext(‘2d’);
const barChart = new Chart(ctx, {
type: ‘bar’,
data: {
labels: [‘红’, ‘蓝’, ‘黄’, ‘绿’, ‘紫’, ‘橙’],
datasets: [{
label: ‘样本数据’,
data: [12, 19, 3, 5, 2, 3],
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 }
}
}
});
})();
</script>
</body>


</html>

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