未捕获的TypeError:无法读取undefined - chart.js的属性'offsetWidth'

Question

我有这个简单的html:

<canvas id="myChart" width="400" height="400"></canvas>

这个js:

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
                    }
                }]
            }
        }
    });

即使画布配置了myChartid,我也会收到以下错误:

Uncaught TypeError: Cannot read property 'offsetWidth' of undefined

JSFiddle:https://jsfiddle.net/kroejrhx/

Answer 1

重新审视问题之后,这是您的问题:您使用的是错误的版本chart.js.根据此部分,如果要使用基于时间的轴,则需要显式包含moment.js或使用包版本.

更改jsfiddle中的资源https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.4/Chart.bundle.min.js将显示预期的图表.根本不需要更改代码.