原生开发&&柱状图

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于 2024-08-30 10:56:20 发布 · 1.2k 阅读

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CC 4.0 BY-SA版权

文章标签：

#前端 #javascript #html

一、先看效果

原生柱状图

二、实现步骤

1、引入chart.js库：

<script src="jscss/chart.js"></script>

如果没有在网上找到chart.js，可以用我文末的。

2、在html页面中加入：

<canvas id="myChart"></canvas>

3、使用js渲染canvas：

var ctx = document.getElementById('myChart').getContext('2d');
            let chart = new Chart(ctx, {
              type: 'bar',
              data: {
                  labels: <?echo $dateStr ? $dateStr : [];?>,
                  datasets: [{
                      label: '<?echo $code?>',
                      data: <?echo $cpStr ? $cpStr : [];?>,
                      backgroundColor: 'rgba(75, 192, 192, 0.2)',
                      borderColor: 'rgba(75, 192, 192, 1)',
                      borderWidth: 1
                  }]
              },
              options: {
                  responsive: true,
                  scales: {
                      y: {
                          beginAtZero: true
                      }
                  }
              }
            });

这里我是用PHP给数据列表赋值的，如果想使用js赋值，可以这样写：

function updateChartData(labels, datasets) {
            myChart.data.labels = labels; // 更新 X轴标签
            myChart.data.datasets = datasets; // 更新 datasets
            
            myChart.update(); // 重新渲染图表
        }

最后，附上chart.js

/**
 * Skipped minification because the original files appears to be already minified.
 * Original file: /npm/chart.js@4.4.4/dist/chart.umd.js
 *
 * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
 */
/*!
 * Chart.js v4.4.4
 * https://www.chartjs.org
 * (c) 2024 Chart.js Contributors
 * Released under the MIT License
 */
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