mapInfo = {
    "mapName": "QDMDWCS",
    "rackCount": 8,
    "crnCount": 2,
    "stbCount": 25,
    "hpPosition": 0,
    "minBayNo": 1,
    "floors": 2,
    "racks": [{
        "type": "rack",
        "id": "rack1",
        "top": 160,
        "left": 525,
        "width": 796,
        "height": 23,
        "minBayNo": 2,
        "maxBayNo": 8
    },{
        "type": "rack",
        "id": "rack2",
        "top": 184,
        "left": 525,
        "width": 796,
        "height": 23,
        "minBayNo": 2,
        "maxBayNo": 8
    }, {
        "type": "rack",
        "id": "rack3",
        "top": 244,
        "left": 525,
        "width": 796,
        "height": 23,
        "minBayNo": 2,
        "maxBayNo": 8
    } ,{
        "type": "rack",
        "id": "rack4",
        "top": 268,
        "left": 525,
        "width": 796,
        "height": 23,
        "minBayNo": 2,
        "maxBayNo": 8
    }],
    "rackDescs": [{
        "type": "rackDescs",
        "id": "lb_desc17",
        "text": "#1",
        "top": 160,
        "left": 1365,
        "width": 30,
        "height": 23
    }, {
        "type": "rackDescs",
        "id": "lb_desc16",
        "text": "#8",
        "top": 402,
        "left": 1367,
        "width": 33,
        "height": 23
    }],
    "crns": [ {
        "type": "track",
        "id": "lb_track1",
        "text": "",
        "top": 224,
        "left": 509,
        "width": 850,
        "height": 2
    },  {
        "type": "crane",
        "id": "crn-1",
        "text": "1",
        "top": 215,
        "left": 503,
        "width": 93,
        "height": 22
    } ],
    "areas": [{
        "type": "Control_floor",
        "id": "tabControl_floor1",
        "text": "楼层",
        "top": 166,
        "left": 380,
        "width": 1374,
        "height": 666,
        "floors": [{
            "type": "floor",
            "id": "page_floor1",
            "text": "1F",
            "top": 104,
            "left": 322,
            "width": 1348,
            "height": 658,
            "stns": [ {
                "type": "stn",
                "id": "site-1003",
                "text": "1001",
                "top": 184,
                "left": 459,
                "width": 65,
                "height": 23
            },  {
                "type": "stn",
                "id": "site-1006",
                "text": "1002",
                "top": 244,
                "left": 459,
                "width": 65,
                "height": 23
            }]
        }]
    }]
}