Antv/G2 折线图 DataSet 数据处理过滤指定字段

DataSet 文档
G2 3.2 DataSet 文档

Demo：

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<meta http-equiv="X-UA-Compatible" content="ie=edge" />
	<title>多折线图dataset过滤数据</title>
</head>
<body>
	<div id="chartcontainer"></div>
	<script>
		/*Fixing iframe window.innerHeight 0 issue in Safari*/ document.body
		.clientHeight
	</script>
 <script src="https://gw.alipayobjects.com/os/lib/antv/g2/4.2.8/dist/g2.min.js"></script>
 <script src="https://gw.alipayobjects.com/os/antv/pkg/_antv.data-set-0.11.1/dist/data-set.js"></script>

 <script>
    var data = [
    {date: '2023/8/1', type: 'london', value: 4623, lrate: 0.33, trate: 0.65}, 
    {date: '2023/8/1', type: 'tokyo', value: 2208, lrate: 0.53, trate: 0.25}, 
    {date: '2023/8/1', type: 'paris', value: 182, lrate: 0.63, trate: 0.15}, 
    {date: '2023/8/2', type: 'london', value: 6145, lrate: 0.13, trate: 0.65}, 
    {date: '2023/8/2', type: 'tokyo', value: 2016, lrate: 0.33, trate: 0.45}, 
    {date: '2023/8/2', type: 'paris', value: 257, lrate: 0.33, trate: 0.05}, 
    {date: '2023/8/3', type: 'london', value: 508, lrate: 0.23, trate: 0.65},
    {date: '2023/8/3', type: 'tokyo', value: 2916, lrate: 0.03, trate: 0.85},
    {date: '2023/8/3', type: 'paris', value: 289, lrate: 0.73, trate: 0.55},
    {date: '2023/8/4', type: 'london', value: 6268, lrate: 0.63, trate: 0.75}, 
    {date: '2023/8/4', type: 'tokyo', value: 4512, lrate: 0.63, trate: 0.65}, 
    {date: '2023/8/4', type: 'paris', value: 428, lrate: 0.53, trate: 0.65}, 
    {date: '2023/8/5', type: 'london', value: 6411, lrate: 0.33, trate: 0.65}, 
    {date: '2023/8/5', type: 'tokyo', value: 8281, lrate: 0.03, trate: 0.45}, 
    {date: '2023/8/5', type: 'paris', value: 619, lrate: 0.13, trate: 0.65},
    {date: '2023/8/6', type: 'london', value: 1890, lrate: 0.43, trate: 0.95}, 
    {date: '2023/8/6', type: 'tokyo', value: 2008, lrate: 0.53, trate: 0.65}, 
    {date: '2023/8/6', type: 'paris', value: 87, lrate: 0.73, trate: 0.35},
    {date: '2023/8/7', type: 'london', value: 4251, lrate: 0.03, trate: 0.75}, 
    {date: '2023/8/7', type: 'tokyo', value: 1963, lrate: 0.13, trate: 0.25}, 
    {date: '2023/8/7', type: 'paris', value: 706, lrate: 0.83, trate: 0.65}
    ];
    var ds = new DataSet(); // 创建DataSet 对象
    var dv = ds.createView().source(data);// 创建数据实例
    let arr = ['date', 'type', 'value']
    dv.transform({
     　 type: 'pick',
        fields: arr
    });
    console.log('dv',dv)
    var chart = new G2.Chart({
    　 container: 'chartcontainer',
       autoFit: true,
    　 height: 500
   　});
    chart.data(dv.rows);
    chart.tooltip({
    crosshairs: {
    　　type: 'line'
    　 }
    });
    chart.axis('value', {
    	　　label: {
            　　formatter: function formatter(val) { // 格式化
            	　　return val + '元';
            　　 　　}
        　　}
    });
    // 自定义图例
    chart.legend('type',{
            clickable: true,
          		position: 'top', // 设置图例的显示位置      
        })
    chart.line().position('date*value').color('type').shape('smooth');
    chart.point().position('date*value').color('type').size(4).shape('circle').style({
            stroke: '#fff',
     　　　　lineWidth: 1
    });
    chart.render();
    </script>
</body>
</html>