通過用戶選擇的上下車點 挑選出匹配的線路let  data=[   {    name:'a',    line:[       {type:'up',place:'上車點一'},       {type:'up',place:'上車點二'},       {type:'up',place:'上車點三'},       {type:'down',place:'下車點一'},       {type:'down',place:'下車點二'}       ]   },   {    name:'b',    line:[       {type:'up',place:'上車點一'},       {type:'up',place:'上車點四'},       {type:'up',place:'上車點五'},       {type:'down',place:'下車點一'},       {type:'down',place:'下車點二'}       ]   },   {    name:'c',    line:[       {type:'up',place:'上車點二'},       {type:'down',place:'下車點一'},       {type:'down',place:'下車點二'}       ]   },   ] let upName='上車點一'let downName='下車點二'循環(huán)data 按照upName 和 downName 挑選出合適的線路 不知道怎么循環(huán)出來  求教 data.forEach(function (item) {     item.line.forEach(function (val) {      if(val.type==='up' && val.place===upName){                }     })   })