利用arcgis for js的圖例小工具 ，所以需要引入：dojo.require("esri.dijit.Legend"); var legendLayers = []; 

function init() {

		//dataurl = "";
		var startExtent = new esri.geometry.Extent(107.66042800183516, 35.2383887783676, 104.28303500160375, 39.38765376928577);
	    map = new esri.Map("mapDiv", {
	    	"spatialReference": { "wkid": 4326 },  //設定座標系
	        logo: false, //取消地圖預設的logo
	        extent: startExtent, //程度
	        zoom:7,  //顯示地圖的級別
	        maxZoom:16  //最大空間等級
	        
	    });
	    xzlayer = new esri.layers.ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services/xx/xxService/MapServer");
	    //設定圖層透明度
	    //xzlayer.setOpacity(0.6);
	    map.addLayer(xzlayer);
	    
	    legendLayers.push({ layer: xzlayer, title: "圖例" });
        var legend = new esri.dijit.Legend({
            map: map,
            autoUpdate: true,
            arrangment: esri.dijit.Legend.ALIGN_RIGHT,
            layerInfos: legendLayers
        }, "legendDiv");
        legend.startup();
    }
	dojo.addOnLoad(init);
 

下面就是準備一個顯示圖例的容器，DIV,下面就是：

#tl{
    z-index: 1000;
    position: absolute;
    right: 30px;
    top: 50px;
    background-color: white;
    opacity: 0.9;
    border: 1px solid #bcdaf5;
    border-radius: 3px;
    font-family: "楷體";
    font-weight: 600;
    color: #302e2e;
    font-size: 20px;
    text-align: center;
}
#Lenged {
    z-index: 1000;
    position: absolute;
    bottom: 2px;
    float: right;
    right: 2px;
    height: 341px;
    width: 180px;
    border: 1px solid #C0C0C0;
    font-size: 16px;
    font-family: "楷體";
    font-weight: 600;
    border-radius: 3px;
    background-color:white;
    opacity:1;
    margin-right: 20px;
}
 

<%--圖例--%>
<div id="Lenged">
   <%-- ☛圖例
    <hr />--%>
    <div id="legendDiv" style="width:100%;"></div>
</div>