Feat：1.节点实例新增高亮和取消高亮的方法；2.调整只读模式搜索高亮节点的方式；Fix：修复只读模式搜索高亮节点时收起节点高亮框未消失的问题；

simple-mind-map/src/constants/constant.js

@@ -346,7 +346,7 @@ export const cssContent = `
     display: block;
   }
 
-  .smm-node.active .smm-hover-node{
+  .smm-node.active .smm-hover-node, .smm-node-highlight .smm-hover-node{
     display: block;
     opacity: 1;
     stroke-width: 2;

simple-mind-map/src/core/render/node/Node.js

@@ -1052,6 +1052,16 @@ class Node {
       height: height * scaleY
     }
   }
+
+  // 高亮节点
+  highlight() {
+    if (this.group) this.group.addClass('smm-node-highlight')
+  }
+
+  // 取消高亮节点
+  closeHighlight() {
+    if (this.group) this.group.removeClass('smm-node-highlight')
+  }
 }
 
 export default Node

simple-mind-map/src/plugins/Search.js

@@ -69,14 +69,14 @@ class Search {
   // 结束搜索
   endSearch() {
     if (!this.isSearching) return
+    if (this.mindMap.opt.readonly && this.matchNodeList[this.currentIndex]) {
+      this.matchNodeList[this.currentIndex].closeHighlight()
+    }
     this.searchText = ''
     this.matchNodeList = []
     this.currentIndex = -1
     this.notResetSearchText = false
     this.isSearching = false
-    if (this.mindMap.opt.readonly) {
-      this.mindMap.renderer.closeHighlightNode()
-    }
     this.emitEvent()
   }
 
@@ -110,7 +110,7 @@ class Search {
       callback()
       // 只读模式下节点无法激活，所以通过高亮的方式
       if (this.mindMap.opt.readonly) {
-        this.mindMap.renderer.highlightNode(currentNode)
+        currentNode.highlight()
       }
     })
   }