我有两个JavaScript文件baseChart.js和chart.min.js。我不想将我的chart.min.js包含到index.html文件中。我只想在我的index.html中包含baseChart.js。
`var s = document.createElement("script");
s.setAttribute("src","js/Chart.min.js");
document.head.appendChild(s);
class BaseChart{
constructor(area, settings) {
this.area = area;
this.settings = settings;
}
a() {
new Chart(this.area, this.settings);
console.log("BaseChart");
}
}
class BarChart extends BaseChart {
constructor(area, settings) {
super(area, settings);
}
/* constructor(ctx) {
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data: [65, 59, 80, 81, 56, 55, 40],
spanGaps: false,
},
{
label: "Second",
data: [12, 56, 45, 23, 78, 23, 90],
}
]
};
var lineChart = new Chart(ctx, {
type: 'line',
data: data
});
} */
b() {
super.a();
}
}`
当前,这是baseChart.js文件,当我尝试运行此代码时,出现错误“未定义图表,因为我使用了'new Chart(this.area,this.settings);'”。并且在调用此方法之前,未初始化chart.min.js。”。我想在初始化此类和方法之前初始化chart.min.js。我使用了chart.js库。所以我该怎么做?
最佳答案
我建议您通过npm安装chart.js
npm install chart.js --save
然后像这样导入它:
// ES6
import Chart from 'chart.js';
我假设您正在使用诸如webpack之类的捆绑程序来使上面的代码起作用。如果不是这样,您必须在baseChart.js之前的索引文件中包含chart.min.js