mapInfo = {
    "mapName": "WCS",
    "rackCount": 18,
    "crnCount": 7,
    "stbCount": 77,
    "hpPosition": 0,
    "minBayNo": 2,
    "floors": 1,
    "racks": [{
        "type": "rack",
        "id": "rack32",
        "top": 410,
        "left": 639,
        "width": 1072,
        "height": 22,
        "minBayNo": 2,
        "maxBayNo": 42
    }, {
        "type": "rack",
        "id": "rack33",
        "top": 458,
        "left": 639,
        "width": 1072,
        "height": 22,
        "minBayNo": 2,
        "maxBayNo": 42
    }, {
        "type": "rack",
        "id": "rack34",
        "top": 479,
        "left": 639,
        "width": 1072,
        "height": 22,
        "minBayNo": 2,
        "maxBayNo": 42
    }, {
        "type": "rack",
        "id": "rack31",
        "top": 389,
        "left": 639,
        "width": 1072,
        "height": 22,
        "minBayNo": 2,
        "maxBayNo": 42
    }],
    "rackDescs": [{
        "type": "rackDescs",
        "id": "lb_desc9",
        "text": "#31",
        "top": 388,
        "left": 1716,
        "width": 33,
        "height": 23
    }, {
        "type": "rackDescs",
        "id": "lb_desc18",
        "text": "#34",
        "top": 479,
        "left": 1716,
        "width": 33,
        "height": 23
    }],
    "crns": [{
        "type": "track",
        "id": "lb_track1",
        "text": "",
        "top": 448,
        "left": 559,
        "width": 1345,
        "height": 2
    }, {
        "type": "crane",
        "id": "crn-1",
        "text": "1",
        "top": 435,
        "left": 805,
        "width": 93,
        "height": 22
    }],
    "areas": [{
        "type": "Control_floor",
        "id": "tabControl_floor1",
        "text": "楼层",
        "top": 68,
        "left": 80,
        "width": 1845,
        "height": 676,
        "floors": [{
            "type": "floor",
            "id": "page_floor1",
            "text": "1F",
            "top": 4,
            "left": 22,
            "width": 1819,
            "height": 668,
            "stns": [ {
                "type": "stn",
                "id": "site-102",
                "text": "102",
                "top": 460,
                "left": 548,
                "width": 89,
                "height": 20
            }, {
                "type": "stn",
                "id": "site-101",
                "text": "101",
                "top": 460,
                "left": 458,
                "width": 89,
                "height": 20
            }]
        }]
    }]
}