diff --git a/lib/index.js b/lib/index.js
index e7b4e58..3692f06 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -383,8 +383,6 @@
       selectToggle: function selectToggle(val, node) {
         var _this2 = this;
 
-        console.log('val:::', val);
-
         if (!this.tree.checkStrictly) {
           var exceptDisabledChecked = node.isExceptDisabledChecked();
           Object.assign(node.data, {
@@ -418,24 +416,26 @@
             vNode: this
           });
         }
-
-        console.log('this.tree.checkedNodes:::', this.tree.checkedNodes);
       },
       clickContent: function clickContent() {
-        console.log('clickContent');
         this.tree.handleClickNode(this);
       },
       handleClickCheckBox: function handleClickCheckBox(e) {
         e.stopPropagation();
       },
-      renderExpandSlot: function renderExpandSlot() {
+      renderExpand: function renderExpand() {
         var h = this.$createElement;
-        var expandIconSlot = this.tree.$scopedSlots.expandIcon;
+        var _this$tree2 = this.tree,
+            expandIconSlot = _this$tree2.$scopedSlots.expandIcon,
+            lazy = _this$tree2.lazy;
         var node = this.node,
             toggleFold = this.toggleFold,
             visibleExpand = this.visibleExpand;
-        var expanded = node.data.expanded;
-        return expandIconSlot ? h("div", {
+        var _node$data = node.data,
+            expanded = _node$data.expanded,
+            isLeaf = _node$data.isLeaf,
+            children = node.children;
+        return children && children.length || lazy && !isLeaf ? expandIconSlot ? h("div", {
           "style": {
             display: visibleExpand
           }
@@ -450,21 +450,21 @@
               return toggleFold(node);
             }
           }
-        }, ["\u25BC"]);
+        }, ["\u25BC"]) : null;
       },
       renderCheckbox: function renderCheckbox() {
         var h = this.$createElement;
         var node = this.node,
             handleClickCheckBox = this.handleClickCheckBox,
             selectToggle = this.selectToggle;
-        var _this$tree2 = this.tree,
-            checkboxSlot = _this$tree2.$scopedSlots.checkbox,
-            showCheckbox = _this$tree2.showCheckbox;
-        var _node$data = node.data,
-            checked = _node$data.checked,
-            partialSelected = _node$data.partialSelected,
-            exceptDisabledChecked = _node$data.exceptDisabledChecked,
-            disabled = _node$data.disabled;
+        var _this$tree3 = this.tree,
+            checkboxSlot = _this$tree3.$scopedSlots.checkbox,
+            showCheckbox = _this$tree3.showCheckbox;
+        var _node$data2 = node.data,
+            checked = _node$data2.checked,
+            partialSelected = _node$data2.partialSelected,
+            exceptDisabledChecked = _node$data2.exceptDisabledChecked,
+            disabled = _node$data2.disabled;
         return showCheckbox ? checkboxSlot ? checkboxSlot({
           handleClickCheckBox: handleClickCheckBox,
           selectToggle: selectToggle,
@@ -512,7 +512,7 @@
       var h = arguments[0];
       var clickContent = this.clickContent,
           activeNode = this.activeNode,
-          renderExpandSlot = this.renderExpandSlot,
+          renderExpand = this.renderExpand,
           renderCheckbox = this.renderCheckbox,
           renderLoading = this.renderLoading,
           renderNodeName = this.renderNodeName;
@@ -520,7 +520,7 @@
         "class": ['node-content', {
           'active-li': activeNode
         }]
-      }, [renderExpandSlot(), h("div", {
+      }, [renderExpand(), h("div", {
         "class": ['inner-wrap'],
         "on": {
           "click": clickContent