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| <canvas id="myChart" width="400" height="400"></canvas>
var ctx = document.getElementById("myChart"); var ctx = document.getElementById("myChart").getContext("2d"); var ctx = $("#myChart"); var ctx = "myChart"; ```
一旦拥有元素或上下文,就可以实例化预定义的图表类型或创建自己的图元类型! 以下示例实例化条形图,显示不同颜色的投票数和从0开始的y轴。 ```html <canvas id="myChart" width="400" height="400"></canvas> <script> var ctx = document.getElementById("myChart"); var myChart = new Chart(ctx, { type: 'bar', data: { labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"], datasets: [{ label: '# of Votes', data: [12, 19, 3, 5, 2, 3], backgroundColor: [ 'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)' ], borderColor: [ 'rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1 }] }, options: { scales: { yAxes: [{ ticks: { beginAtZero:true } }] } } }); </script>
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