麻烦使用变量传递动态条目

Question

以下JavaScript代码使用chart.js显示折线图。代码工作正常但是，如果你看看标签附近的代码部分，我试图使用变量动态传递它，而不是有一个静态的月份列表。例如，我只想从1月到5月通过。

我使用变量x来执行此操作，但它不能作为单独的标签工作，它将在图像中显示为一个标签示例。有没有办法可以动态传递这些标签？我不想使用单独的变量，因为我的列表将基于n。

原创

var lineChartData = {
            labels : ["January","February","March","April","May","June","July","August","September","October","November","December"],
            datasets : [
                {
                    label: "My First dataset",
                    fillColor : "rgba(54,61,251,0.2)",
                    strokeColor : "rgba(54,61,251,1)",
                    pointColor : "rgba(54,61,251,1)",
                    pointStrokeColor : "#fff",
                    pointHighlightFill : "#fff",
                    pointHighlightStroke : "rgba(54,61,251,1)",
                    data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
                }

修改版

var randomScalingFactor = function(){ return Math.round(Math.random()*100)};

        var x = ' \"January\" , \"February\" ';
        var lineChartData = {
            labels : [x,"March","April","May","June","July","August","September","October","November","December"],
            datasets : [
                {
                    label: "My First dataset",
                    fillColor : "rgba(54,61,251,0.2)",
                    strokeColor : "rgba(54,61,251,1)",
                    pointColor : "rgba(54,61,251,1)",
                    pointStrokeColor : "#fff",
                    pointHighlightFill : "#fff",
                    pointHighlightStroke : "rgba(54,61,251,1)",
                    data : [randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor(),randomScalingFactor()]
                }
            ]

        }

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

Answer 1

您想要的是将x（当前声明为字符串）声明为数组。您使用.concat将两个数组连接在一起，以便您的labels属性具有完整列表：

    var x = ["January", "February"];
    var lineChartData = {
        labels : x.concat(["March","April","May","June","July","August","September","October","November","December"]),