请问怎么从json对象从取值，放到demo的对象中

var json ={"SnapPolygonList":{"SnapPolygon":[{"id":"1","polygonType":"1","color":{"r":"0","g":"255","b":"0"},"tips":"#1#","isClosed":"true","pointList":{"point":[{"x":"0.324415","y":"0.496516"},{"x":"0.538462","y":"0.486063"},{"x":"0.438127","y":"0.806620"},{"x":"0.269231","y":"0.759582"}]}},{"id":"2","polygonType":"1","color":{"r":"255","g":"0","b":"0"},"tips":"#2#","isClosed":"true","pointList":{"point":[{"x":"0.168896","y":"0.728223"},{"x":"0.650502","y":"0.780488"},{"x":"0.493311","y":"0.945993"},{"x":"0.143813","y":"0.970383"},{"x":"0.157191","y":"0.949477"}]}}]}};

var eventparameter = { "事件参数": {

    "布防区域": [
{
"区域坐标": [
[0.2001, 0.2001],
[0.5002, 0.2002],
[0.5003, 0.5003],
[0.2004, 0.5004]
],
"区域编号": 1
}
],
"开始检测时间": "00:00:00",
"撤防区域": [
{
"区域坐标": [
[
0.24861111111111112,
0.27256944444444442
],
[
0.65555555555555556,
0.22395833333333334
],
[
0.56805555555555554,
0.55208333333333337
],
[
0.40138888888888891,
0.68055555555555558
]
],
"区域编号": 1
}
]
}

}

var demo = {
"事件参数": {
"布防区域": [
{
"区域坐标": [
point
],
"区域编号": id
}
],
"开始检测时间": "00:00:00",
"撤防区域": [
{
"区域坐标": [
point
],
"区域编号": id
}
]
}
};

回答

var json ={"SnapPolygonList":{"SnapPolygon":[{"id":"1","polygonType":"1","color":{"r":"0","g":"255","b":"0"},"tips":"#1#","isClosed":"true","pointList":{"point":[{"x":"0.324415","y":"0.496516"},{"x":"0.538462","y":"0.486063"},{"x":"0.438127","y":"0.806620"},{"x":"0.269231","y":"0.759582"}]}},{"id":"2","polygonType":"1","color":{"r":"255","g":"0","b":"0"},"tips":"#2#","isClosed":"true","pointList":{"point":[{"x":"0.168896","y":"0.728223"},{"x":"0.650502","y":"0.780488"},{"x":"0.493311","y":"0.945993"},{"x":"0.143813","y":"0.970383"},{"x":"0.157191","y":"0.949477"}]}}]}};
var eventAttributes = {
  '布防区域': [],
  '撤防区域': [],
  '开始检测时间': '00:00:00'
};
for (var snap of json.SnapPolygonList.SnapPolygon) {
  var pointList = [];
  for (var point of snap.pointList.point) {
    pointList.push([point.x, point.y]);
  }
  if (snap.color.r === '0') {
    eventAttributes['布防区域'].push({
      '区域坐标': pointList,
      '区域编号': snap.id
    });
  }
  if (snap.color.r === '255') {
    eventAttributes['撤防区域'].push({
      '撤防区域': pointList,
      '区域编号': snap.id
    });
  }
};
console.log(eventAttributes);
  var  bb =[{
        "x": "0.008361",
        "y": "0.005587"
    }, {
        "x": "0.991639",
        "y": "0.019553"
    }, {
        "x": "0.991639",
        "y": "0.986033"
    }, {
        "x": "0.006689",
        "y": "0.980447"
    }];
    function helpTransform(data) {
        var result = []
        var isArray = Object.prototype.toString.call(data) === '[object Array]'
        if (!isArray) {
            return result
        }
        for(var i = 0, len = data.length; i < len; i++) {
            var temp = data[i]
            var arr = [temp.x, temp.y]
            result.push(arr)
        }
        return result
    }
    var dd  =helpTransform(bb);
    console.log(dd);
    var json ={"SnapPolygonList":{"SnapPolygon":[{"id":"1","polygonType":"1","color":{"r":"0","g":"255","b":"0"},"tips":"#1#","isClosed":"true","pointList":{"point":[{"x":"0.324415","y":"0.496516"},{"x":"0.538462","y":"0.486063"},{"x":"0.438127","y":"0.806620"},{"x":"0.269231","y":"0.759582"}]}},{"id":"2","polygonType":"1","color":{"r":"255","g":"0","b":"0"},"tips":"#2#","isClosed":"true","pointList":{"point":[{"x":"0.168896","y":"0.728223"},{"x":"0.650502","y":"0.780488"},{"x":"0.493311","y":"0.945993"},{"x":"0.143813","y":"0.970383"},{"x":"0.157191","y":"0.949477"}]}}]}};
    var eventAttributes = {
        '布防区域': [],
        '撤防区域': [],
        '开始检测时间': '00:00:00'
    };
    json.SnapPolygonList.SnapPolygon.forEach(function(snap) {
        if (snap.color.r === '0') {
            eventAttributes['布防区域'].push({
                '区域坐标': helpTransform(snap.pointList),
                '区域编号': snap.id
            });
        }
        if (snap.color.r === '255') {
            eventAttributes['撤防区域'].push({
                '撤防区域': helpTransform(snap.pointList),
                '区域编号': snap.id
            });
        }
    });
    console.log(eventAttributes);

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