How to achieve asynchronous data fetching in Echarts?

To achieve asynchronous data retrieval in ECharts, you can follow these steps:

1. Include the ECharts script file in an HTML document, for example:

<script src="https://cdn.jsdelivr.net/npm/echarts@5.2.0/dist/echarts.min.js"></script>

1. Create a container for displaying charts, such as:

<div id="chartContainer" style="width: 600px; height: 400px;"></div>

1. In JavaScript files, use AJAX, Fetch, or other asynchronous request methods to retrieve data.

function getData(callback) {
  // 发起异步请求获取数据
  // 例如使用 Fetch 方法：
  fetch('data.json')
    .then(response => response.json())
    .then(data => {
      // 调用回调函数将获取的数据传递给图表渲染函数
      callback(data);
    });
}

1. After obtaining the data, use ECharts API to render the chart, for example:

// 获取容器元素
var chartContainer = document.getElementById('chartContainer');

// 创建图表实例
var chart = echarts.init(chartContainer);

// 创建图表配置对象
var option = {
  // 配置项...
};

// 渲染图表
function renderChart(data) {
  // 在配置项中使用获取到的数据
  option.series[0].data = data;

  // 使用刚指定的配置项和数据显示图表
  chart.setOption(option);
}

// 调用获取数据的函数，并传递渲染图表的回调函数
getData(renderChart);

Following these steps will allow you to achieve asynchronous data fetching and chart rendering in ECharts. Please modify the way the data is retrieved and the data processing logic according to the actual situation.