layer = new SuperMap.Layer.TiledDynamicRESTLayer("地图", url, {
        transparent : true,
        cacheEnabled : true,
        redirect: true,
        layersID: tempLayerID//
    }, {
        maxResolution : "auto",
        bufferImgCount: 0//
    });
加载子图层时layer.params.layersID = str;layer.redraw();
其中str字符串在自己写的方法里测试时长度不能超过32,并且f12控制台报400 bad request,而api中实例给的str的长度远远超过32位,也不报错