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 //圆形范围关键字搜索
    this.SearchCircle = function(keyWords) {
        if (this.flag == false) {
            this.flag = true;
            this.currentCircle = new BMap.Circle(this.currentCenterPoint, this.currentDistance, {
            strokeColor: "#0075C7",
            strokeWeight: 1,
            fillColor: "blue",
            fillOpacity: 0.2,
            strokeOpacity:0.5
            }); //创建圆
            this.currentBdMap.addOverlay(this.currentCircle);
        }
        var locals = new BMap.LocalSearch(this.currentBdMap, {
            renderOptions: {
                map: this.currentBdMap,
                autoViewport: false
            }
        });
        var bounds = getSquareBounds(this.currentCircle.getCenter(), this.currentCircle.getRadius(), this.currentBdMap);
        locals.searchInBounds(keyWords, bounds);
 
        function getSquareBounds(centerPoi, r, map) {
            var a = Math.sqrt(2) * r; //正方形边长
            mPoi = getMecator(centerPoi, map);
            var x0 = mPoi.x,
            y0 = mPoi.y;
 
            var x1 = x0 + a / 2,
            y1 = y0 + a / 2; //东北点
            var x2 = x0 - a / 2,
            y2 = y0 - a / 2; //西南点
            var ne = getPoi(new BMap.Pixel(x1, y1), map),
            sw = getPoi(new BMap.Pixel(x2, y2), map);
            return new BMap.Bounds(sw, ne);
 
        }
        //根据球面坐标获得平面坐标。
        function getMecator(poi, map) {
            return map.getMapType().getProjection().lngLatToPoint(poi);
        }
        //根据平面坐标获得球面坐标。
        function getPoi(mecator, map) {
            return map.getMapType().getProjection().pointToLngLat(mecator);
        }
    }