折线图堆叠的重要参数stack。只要将stack的值设置不相同，就不会堆叠了。实例如下：
option = {
title: {
text: '折线图堆叠'
},
tooltip: {
trigger: 'axis'
},
legend: {
data:['邮件营销','联盟广告','视频广告','直接访问','搜索引擎']
},
grid: {
left: '3%',
right: '4%',
bottom: '3%',
containLabel: false
},
xAxis: {
type: 'category',
boundaryGap: false,
data: ['周一','周二','周三','周四','周五','周六','周日']
},
yAxis: {
type: 'value'
},
series: [
{
name:'邮件营销',
type:'line',
stack: '总量1',
data:[120, 132, 101, 134, 90, 230, 210]
},
{
name:'联盟广告',
type:'line',
stack: '总量2',
data:[220, 182, 191, 234, 290, 330, 310]
}
]
};
