在shanghaiStreetMapDasai.vue中优化样式，增加z-index以提升层级，同时在initRelationshipChart函数中设置图表缩放比例为0.8。

src/views/shanghaiStreetMapDasai.vue

@@ -338,7 +338,7 @@
       <span ref="ripple" class="ripple"></span>
     </div>
     <div
-      class="flex items-center justify-center w-96 h-48 border-2 border-dashed rounded border-gray-500 overflow-hidden"
+      class="flex items-center justify-center w-96 h-48 border-2 border-dashed rounded border-gray-500 overflow-hidden z-[999]"
       ref="main9" v-show="relationShow">
 
     </div>
@@ -3651,6 +3651,7 @@ const initRelationshipChart = () => {
         {
           type: "graph", // 图类型为关系图
           layout: "force", // 使用力引导布局
+          zoom: 0.8,
           force: {
             repulsion: 1000, // 节点之间的斥力
             edgeLength: 1000, // 边的长度