feat: 全览节点无记录时Toast友好提示替代静默短路

track-uniapp/src/pages/scan/components/TreeCanvas.vue

@@ -42,7 +42,7 @@
             <view v-for="node in treeNodes" :key="node.id"
               class="canvas-node" :class="[statusColor(node.status), node._isMain ? 'node-main' : 'node-sub']"
               :style="{ left: node.x + 'px', top: node.y + 'px' }"
-              @tap="node.records && node.records.length && $emit('viewRecords', node)">
+              @tap="handleNodeTap(node)">
               <view class="cn-header">
                 <text :class="node._isMain ? 'badge-main' : 'badge-sub'">{{ node._isMain ? '主分支' : node._blabel }}</text>
                 <text :class="['cn-badge-mini', statusColor(node.status)]">{{ statusLabel(node.status) }}</text>
@@ -196,6 +196,13 @@ export default {
   methods: {
     onScale(e) { if (e?.detail?.scale) this.mvScale = e.detail.scale; },
     zoomIn() { this.mvScale = Math.min(5, +(this.mvScale + 0.2).toFixed(1)); },
+    handleNodeTap(node) {
+      if (node.records && node.records.length > 0) {
+        this.$emit('viewRecords', node);
+      } else {
+        uni.showToast({ title: '当前节点暂无流转记录', icon: 'none' });
+      }
+    },
     zoomOut() { this.mvScale = Math.max(0.1, +(this.mvScale - 0.2).toFixed(1)); },
     fitAll() { this.mvScale = this.fitScale; this.mvX = 0; this.mvY = 0; },
     fmtDate(d) { if (!d) return ""; const dt = new Date(d); return (dt.getMonth() + 1) + '/' + dt.getDate(); },