javascript - 如何使用 Chart.js 更改条形图中仅一列的颜色

Question

js

http://www.chartjs.org/docs/#bar-chart

我正在使用基本示例:

HTML

<canvas id="canvas" height="450" width="600"></canvas>

JS

var data = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.5)",
            strokeColor: "rgba(220,220,220,0.8)",
            highlightFill: "rgba(220,220,220,0.75)",
            highlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        }
    ]
};

window.onload = function(){
    var ctx = document.getElementById("canvas").getContext("2d");
    window.myBar = new Chart(ctx).Bar(data, {
         responsive : true
    });
}

我想改变一列的颜色。我该怎么做？我多次尝试了很多教程，但没有找到解决方案。你能帮帮我吗？

Answer 1

你可以像这样改变颜色。这是一个jsfiddle

var data = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.5)",
            strokeColor: "rgba(220,220,220,0.8)",
            highlightFill: "rgba(220,220,220,0.75)",
            highlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        }
    ]
};
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx).Bar(data);

// change color of first bar
myChart.datasets[0].bars[0].fillColor = "rgba(255,0,0,1)";
myChart.update();