新人求助！

Question

var ls={
    hotcity:[
            {oi:"b",name:"北京",x:"12956000",y:"4824875",level:10,bus:1},
            {oi:"s",name:"上海",x:"13522000",y:"3641093",level:11,bus:1},
            {oi:"g",name:"广州",x:"12614437",y:"2631281",level:12,bus:1},
            {oi:"s",name:"深圳",x:"12694500",y:"2562500",level:12,bus:1},
            {oi:"c",name:"成都",x:"11585750",y:"3567500",level:11,bus:1},
            {oi:"t",name:"天津",x:"13046000",y:"4714250",level:11,bus:1},
            {oi:"x",name:"西安",x:"12127500",y:"4039281",level:11,bus:1},
            {oi:"n",name:"南京",x:"13222250",y:"3747750",level:11,bus:1},
            {oi:"c",name:"重庆",x:"11857375",y:"3424562",level:11,bus:1},
            {oi:"x",name:"香港",x:"12705437",y:"2539812",level:11,bus:0},
            {oi:"a",name:"澳门",x:"12640003",y:"2518359",level:15,bus:0}
        ],
  all:{name:"全国",x:"11944000",y:"4152000",level:4,bus:0},
    city:[
            {oi:"b",name:"北京",x:"12956000",y:"4824875",level:10,bus:1},
            {oi:"s",name:"上海",x:"13522000",y:"3641093",level:11,bus:1},
            {oi:"t",name:"天津",x:"13046000",y:"4714250",level:11,bus:1},
            {oi:"c",name:"重庆",x:"11857375",y:"3424562",level:11,bus:1},
            {oi:"x",name:"香港",x:"12705437",y:"2539812",level:11,bus:0},
            {oi:"a",name:"澳门",x:"12640003",y:"2518359",level:15,bus:0}
        ]
}
请问在JS中，这种数组该怎么用？

Answer 1

三维数组,比如说'深圳'在'hitcity'中的第四个元素,键值为name
ls['hotcity'][3]['name']; //深圳