今天对Echarts的事件处理等比较高级的功能进行了学习，并实现了一个实例
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ECharts 实例</title>
<!-- 引入 echarts.js -->
<script src="https://cdn.staticfile.org/echarts/4.3.0/echarts.min.js"></script>
</head>
<body>
<!-- 为ECharts准备一个具备大小（宽高）的Dom -->
<div id="main" style="height: 100%;min-height:400px;"></div>
<script type="text/javascript">
// 基于准备好的dom，初始化ECharts实例
var myChart = echarts.init(document.getElementById('main'));
var app = {};
option = null;
// 指定图表的配置项和数据
var option = {
title : {
text: '饼图程序调用高亮示例',
x: 'center'
},
tooltip: {
trigger: 'item',
formatter: "{a} <br/>{b} : {c} ({d}%)"
},
legend: {
orient: 'vertical',
left: 'left',
data: ['直接访问','邮件营销','联盟广告','视频广告','搜索引擎']
},
series : [
{
name: '访问来源',
type: 'pie',
radius : '55%',
center: ['50%', '60%'],
data:[
{value:335, name:'直接访问'},
{value:310, name:'邮件营销'},
{value:234, name:'联盟广告'},
{value:135, name:'视频广告'},
{value:1548, name:'搜索引擎'}
],
itemStyle: {
emphasis: {
shadowBlur: 10,
shadowOffsetX: 0,
shadowColor: 'rgba(0, 0, 0, 0.5)'
}
}
}
]
};
app.currentIndex = -1;
setInterval(function () {
var dataLen = option.series[0].data.length;
// 取消之前高亮的图形
myChart.dispatchAction({
type: 'downplay',
seriesIndex: 0,
dataIndex: app.currentIndex
});
app.currentIndex = (app.currentIndex + 1) % dataLen;
// 高亮当前图形
myChart.dispatchAction({
type: 'highlight',
seriesIndex: 0,
dataIndex: app.currentIndex
});
// 显示 tooltip
myChart.dispatchAction({
type: 'showTip',
seriesIndex: 0,
dataIndex: app.currentIndex
});
}, 1000);
if (option && typeof option === "object") {
myChart.setOption(option, true);
}
</script>
</body>
</html>
