百度地图API new BMap.Point如何成为变量

var p = " new BMap.Point(110.538229, 37.326786), new BMap.Point(110.525581, 37.339109), new BMap.Point(110.481888, 37.358619)";
            var polygon = new BMap.Polygon([
            new BMap.Point(110.538229, 37.326786), new BMap.Point(110.525581, 37.339109), new BMap.Point(110.481888, 37.358619) //此方式可以
    p   //换成变量不行
    ],)