javascript - 为图表JS的数据值添加小数点

Question

这告诉我如何向图表 JS 添加数据值 - Adding data values to chart JS

现在我想向这些值添加逗号，例如 5,000 6,000 而不是 5000 6000

JSFiddle for data values code

            var chartData = {
                labels: ["January", "February", "March", "April", "May", "June"],
                datasets: [
                    {
                        fillColor: "#79D1CF",
                        strokeColor: "#79D1CF",
                        data: [60, 80, 81, 56, 55, 40]
                    }
                ]
            };

            var ctx = document.getElementById("myChart1").getContext("2d");
            var myLine = new Chart(ctx).Line(chartData, {
                showTooltips: false,
                onAnimationComplete: function () {

                    var ctx = this.chart.ctx;
                    ctx.font = this.scale.font;
                    ctx.fillStyle = this.scale.textColor
                    ctx.textAlign = "center";
                    ctx.textBaseline = "bottom";

                    this.datasets.forEach(function (dataset) {
                        dataset.points.forEach(function (points) {
                            ctx.fillText(points.value, points.x, points.y - 10);
                        });
                    })
                }
            });

            var ctx = document.getElementById("myChart2").getContext("2d");
            var myBar = new Chart(ctx).Bar(chartData, {
                showTooltips: false,
                onAnimationComplete: function () {

                    var ctx = this.chart.ctx;
                    ctx.font = this.scale.font;
                    ctx.fillStyle = this.scale.textColor
                    ctx.textAlign = "center";
                    ctx.textBaseline = "bottom";

                    this.datasets.forEach(function (dataset) {
                        dataset.bars.forEach(function (bar) {
                            ctx.fillText(bar.value, bar.x, bar.y - 5);
                        });
                    })
                }
            });

Answer 1

不幸的是，JavaScript 中没有针对此答案的内置跨浏览器解决方案:

How to print a number with commas as thousands separators in JavaScript

您可以使用 fiddle 中包含的numbersWithCommas:

var numberWithCommas = function(x) {
    return x
        .toString()
        .replace(/\B(?=(\d{3})+(?!\d))/g, ",");
};

只需在 this.datasets.forEach 函数中包含 bar.value = numberWithCommas(bar.value);

这将在将数字附加到图表之前用逗号格式化数字。