echarts实现动态折线图

ゝ一纸荒年。 2022-05-15 02:24 726阅读 0赞

<!DOCTYPE html>
    
    <html>
    
    	<head>
    		<meta charset="UTF-8">
    		<title></title>
    	</head>
    	
    	<script type="text/javascript" src="js/echarts.js"></script>
    
    	<body>
    		<div id="main" style="width: 600px;height:400px;"></div>
    	</body>
    
    </html>
    <script type="text/javascript">
    	// 基于准备好的dom，初始化echarts实例	
    	var myChart = echarts.init(document.getElementById('main'));
    
    	function randomData() {
    		now = new Date(+now + oneDay);
    		value = value + Math.random() * 21 - 10;
    		return {
    			name: now.toString(),
    			value: [
    				[now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'),
    				Math.round(value)
    			]
    		}
    	}
    	var data = [];
    	var now = +new Date(1997, 9, 3);
    	var oneDay = 24 * 3600 * 1000;
    	var value = Math.random() * 1000;
    	for(var i = 0; i < 1000; i++) {
    		data.push(randomData());
    	}
    	option = {
    		title: {
    			text: '动态数据 + 时间坐标轴'
    		},
    		tooltip: {
    			trigger: 'axis',
    			formatter: function(params) {
    				params = params[0];
    				var date = new Date(params.name);
    				return date.getDate() + '/' + (date.getMonth() + 1) + '/' + date.getFullYear() + ' : ' + params.value[1];
    			},
    			axisPointer: {
    				animation: false
    			}
    		},
    		xAxis: {
    			type: 'time',
    			splitLine: {
    				show: false
    			}
    		},
    		yAxis: {
    			type: 'value',
    			boundaryGap: [0, '100%'],
    			splitLine: {
    				show: false
    			}
    		},
    		series: [{
    			name: '模拟数据',
    			type: 'line',
    			showSymbol: false,
    			hoverAnimation: false,
    			data: data,
    			markLine: {
    				itemStyle: {
    					normal: {
    						borderWidth: 1,
    						lineStyle: {
    							type: "dash",
    							color: 'red',
    							width: 2
    						},
    						label: {
    							formatter: 'COD',
    							textStyle: {
    								fontSize: 16,
    								fontWeight: "bolder"
    							}
    						},
    						show: true,
    						color: '#4c5336'
    					}
    				},
    				data: [{
    					yAxis: 900
    				}]
    			},
    		}],
    	};
    	// 使用刚指定的配置项和数据显示图表。	
    	myChart.setOption(option);
    	setInterval(function() {
    		for(var i = 0; i < 5; i++) {
    			data.shift();
    			data.push(randomData());
    		}
    		myChart.setOption({
    			series: [{
    				data: data
    			}]
    		});
    	}, 1000);
    </script>