使用 Chart js，我尝试从 Ajax 调用中提取数据以提供给 Chart。 我发现其他一些帖子中有人建议延迟画布加载，但似乎没有任何效果。目前，这是我下面所拥有的，我得到的错误是

$(function () {

GetChartData();

    function GetChartData() {
    $.ajax({
        url: ajaxURL,
        method: 'GET',
        dataType: 'json',
        success: function (d) {
            //-------------
            //- BAR CHART -
            //-------------
            var barChartData = d;
            var barChartCanvas = $("#barChart").get(0).getContext("2d");
            var barChart = new Chart(barChartCanvas);
            // console.log(datajson);
            //barChartData.datasets[1].fillColor = "#00a65a";
            //barChartData.datasets[1].strokeColor = "#00a65a";
            //barChartData.datasets[1].pointColor = "#00a65a";
            var barChartOptions = {
                //Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
                //scaleBeginAtZero: true,
                //Boolean - Whether grid lines are shown across the chart
                scaleShowGridLines: true,
                //String - Colour of the grid lines
                scaleGridLineColor: "rgba(0,0,0,.05)",
                //Number - Width of the grid lines
                scaleGridLineWidth: 1,
                //Boolean - Whether to show horizontal lines (except X axis)
                scaleShowHorizontalLines: true,
                //Boolean - Whether to show vertical lines (except Y axis)
                scaleShowVerticalLines: true,
                //Boolean - If there is a stroke on each bar
                barShowStroke: true,
                //Number - Pixel width of the bar stroke
                barStrokeWidth: 2,
                //Number - Spacing between each of the X value sets
                barValueSpacing: 5,
                //Number - Spacing between data sets within X values
                barDatasetSpacing: 1,
                multiTooltipTemplate: "<%=datasetLabel%>: <%= value + ' %' %>",
                //String - A legend template
                legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].fillColor%>\"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>",
                //Boolean - whether to make the chart responsive
                responsive: true,
                maintainAspectRatio: true
            };


            barChartOptions.datasetFill = false;
            barChart.Bar(barChartData, barChartOptions);


        }
    });
    }
});

此处更新显示非 AJAX 的工作原理

以下代码获取 Ajax 获取请求的结果（我从将其转储到控制台获得）并创建相同内容的“硬编码”版本。从技术上讲，唯一不同的是，一个在页面加载时加载数据，第二个在页面加载后很短时间加载数据。

 var chartData = {
    "labels": [
      "April"
    ],
    "datasets": [
      {
          "label": "Not Sure What to Put Here",
          "fillColor": "#662B60",
          "strokeColor": "#662B60",
          "pointColor": "#662B60",
          "pointStrokeColor": "#662B60",
          "pointHighlightFill": "#662B60",
          "pointHighlightStroke": "#662B60",
          "data": [
            1
          ]
      },
      {
          "label": "Not Sure What to Put Here",
          "fillColor": "#88B56E",
          "strokeColor": "#88B56E",
          "pointColor": "#88B56E",
          "pointStrokeColor": "#88B56E",
          "pointHighlightFill": "#88B56E",
          "pointHighlightStroke": "#88B56E",
          "data": [
            1
          ]
      },
      {
          "label": "Not Sure What to Put Here",
          "fillColor": "#48CA2B",
          "strokeColor": "#48CA2B",
          "pointColor": "#48CA2B",
          "pointStrokeColor": "#48CA2B",
          "pointHighlightFill": "#48CA2B",
          "pointHighlightStroke": "#48CA2B",
          "data": [
            0.83
          ]
      }
    ]
};


    //-------------
    //- BAR CHART -
    //-------------
var barChartData = chartData;
    var barChartCanvas = $("#barChart").get(0).getContext("2d");
    var barChart = new Chart(barChartCanvas);

    //barChartData.datasets[1].fillColor = "#00a65a";
    //barChartData.datasets[1].strokeColor = "#00a65a";
    //barChartData.datasets[1].pointColor = "#00a65a";
    var barChartOptions = {
        //Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
        //scaleBeginAtZero: true,
        //Boolean - Whether grid lines are shown across the chart
        scaleShowGridLines: true,
        //String - Colour of the grid lines
        scaleGridLineColor: "rgba(0,0,0,.05)",
        //Number - Width of the grid lines
        scaleGridLineWidth: 1,
        //Boolean - Whether to show horizontal lines (except X axis)
        scaleShowHorizontalLines: true,
        //Boolean - Whether to show vertical lines (except Y axis)
        scaleShowVerticalLines: true,
        //Boolean - If there is a stroke on each bar
        barShowStroke: true,
        //Number - Pixel width of the bar stroke
        barStrokeWidth: 2,
        //Number - Spacing between each of the X value sets
        barValueSpacing: 5,
        //Number - Spacing between data sets within X values
        barDatasetSpacing: 1,
        multiTooltipTemplate: "<%=datasetLabel%>: <%= value + ' %' %>",
        //String - A legend template
        legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].fillColor%>\"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>",
        //Boolean - whether to make the chart responsive
        responsive: true,
        maintainAspectRatio: true
    };


    barChartOptions.datasetFill = false;
    barChart.Bar(barChartData, barChartOptions);

更新 我将 chart.js 的最低版本更改为完整版本，这样我就能知道到底哪里出错了。

这是来自 chrome 控制台的图片