关于js数组匹配的问题

Question

通过用户选择的上下车点 挑选出匹配的线路let  data=[   {    name:'a',    line:[       {type:'up',place:'上车点一'},       {type:'up',place:'上车点二'},       {type:'up',place:'上车点三'},       {type:'down',place:'下车点一'},       {type:'down',place:'下车点二'}       ]   },   {    name:'b',    line:[       {type:'up',place:'上车点一'},       {type:'up',place:'上车点四'},       {type:'up',place:'上车点五'},       {type:'down',place:'下车点一'},       {type:'down',place:'下车点二'}       ]   },   {    name:'c',    line:[       {type:'up',place:'上车点二'},       {type:'down',place:'下车点一'},       {type:'down',place:'下车点二'}       ]   },   ] let upName='上车点一'let downName='下车点二'循环data 按照upName 和 downName 挑选出合适的线路 不知道怎么循环出来  求教 data.forEach(function (item) {     item.line.forEach(function (val) {      if(val.type==='up' && val.place===upName){                }     })   })