您好,接口没问题,请检查你的代码

<script type="text/javascript">
	var map, layer, pointVector, 
	url = "http://localhost:8090/iserver/services/map-world/rest/maps/World";
	function init() {
		map = new SuperMap.Map("map");
		layer = new SuperMap.Layer.TiledDynamicRESTLayer("World", url, null, { maxResolution: "auto" });
		layer.events.on({ "layerInitialized": addLayer });
		vector = new SuperMap.Layer.Vector("vector");
		addData();
	}
	function addLayer() {
		map.addLayers([layer, vector]);
		map.setCenter(new SuperMap.LonLat(0, 0), 0);
	}
	function addData() {
		var geoText = new SuperMap.Geometry.GeoText(100, 35, "中华人民共和国");
		var geotextFeature = new SuperMap.Feature.Vector(geoText);
		var strategy = new SuperMap.Strategy.GeoText();
		strategy.style = {
			fontColor: "#FF7F00",
			fontWeight: "bolder",
			fontSize: "14px",
			fill: true,
			fillColor: "#FFFFFF",
			fillOpacity: 1,
			stroke: true,
			strokeColor: "#8B7B8B"
		};
		var vectorLayer = new SuperMap.Layer.Vector("Label", { strategies: [strategy] });
		map.addLayers([vectorLayer]);
		vectorLayer.addFeatures([geotextFeature]);
	}
</script>