update

examples/play/index.vue

@@ -1,15 +1,74 @@
 <template>
   <div style="margin: 20px;">
-    <el-input v-model="input" placeholder="请输入内容"></el-input>
+    <el-tree :data="data" :props="defaultProps" :highlight-current="true" node-key="id" @node-click="handleNodeClick" ref="dataTree"></el-tree>
+    <button @click="setCurrent">选中</button>
+    <button @click="clearCurrent">取消选中</button>
   </div>
 </template>
 
 <script>
   export default {
     data() {
       return {
-        input: 'Hello Element UI!'
+        data: [{
+          label: '一级 1',
+          id:1,
+          children: [{
+            label: '二级 1-1',
+            id:11,
+            children: [{
+              label: '三级 1-1-1'
+            }]
+          }]
+        }, {
+          label: '一级 2',
+          id:2,
+          children: [{
+            label: '二级 2-1',
+            id:21,
+            children: [{
+              label: '三级 2-1-1'
+            }]
+          }, {
+            label: '二级 2-2',
+            id:22,
+            children: [{
+              label: '三级 2-2-1'
+            }]
+          }]
+        }, {
+          label: '一级 3',
+          id:3,
+          children: [{
+            label: '二级 3-1',
+            id:31,
+            children: [{
+              label: '三级 3-1-1'
+            }]
+          }, {
+            label: '二级 3-2',
+            id:32,
+            children: [{
+              label: '三级 3-2-1'
+            }]
+          }]
+        }],
+        defaultProps: {
+          children: 'children',
+          label: 'label'
+        }
       };
+    },
+    methods: {
+      handleNodeClick(data) {
+        console.log(data);
+      },
+      setCurrent(){
+        this.$refs.dataTree.setCurrentKey(1);
+      },
+      clearCurrent(){
+        this.$refs.dataTree.setCurrentKey(null);
+      }
     }
   };
 </script>

packages/tree/src/model/tree-store.js

@@ -328,7 +328,7 @@ export default class TreeStore {
 
   setCurrentNodeKey(key) {
     if (key === null || key === undefined) {
-      this.currentNode && (this.currentNode.isCurrent = false);
+      this.currentNode.isCurrent = false;
       this.currentNode = null;
       return;
     }