来源：https://blog.csdn.net/sinat_36422236/article/details/62430114
series : [
{
name:\'your name\',
symbol:\'none\', //这句就是去掉点的
smooth:true, //这句就是让曲线变平滑的
type:\'line\',
stack: \'总量\',
data:[0, 0, 0, 0, 0, 0, 0]
},
]