legend: {
  align: 'left', //图例的位置
  x: 50,
  y: 20,  
  data:[
    {
   ​   name:'vue',
 ​ ​    icon:'circle'
    },
    {
      name:'node',
      icon:'circle'
     },
     {
      name:'php',
      icon:'circle'
     },
  ]
},