diff --git a/static/js/tree.js b/static/js/tree.js
index a53f880..055cfb5 100644
--- a/static/js/tree.js
+++ b/static/js/tree.js
@@ -1,5 +1,5 @@
 var tree = {
-    fileTree: {},
+    fileTree: undefined,
     newFile: function() {
         $("#dirRMenu ul").hide();
         var name = prompt("Name", "");
@@ -96,62 +96,23 @@ var tree = {
                                     wide.curNode = treeNode;
                                     if ("f" === treeNode.type) { // 如果右击了文件
                                         $("#fileRMenu ul").show();
-                                        fileRMenu.css({"top": event.clientY - 10 + "px", "left": event.clientX + "px", "display": "block"});
+                                        fileRMenu.css({
+                                            "top": event.clientY - 10 + "px",
+                                            "left": event.clientX + "px",
+                                            "display": "block"
+                                        });
                                     } else { // 右击了目录
                                         $("#dirRMenu ul").show();
-                                        dirRMenu.css({"top": event.clientY - 10 + "px", "left": event.clientX + "px", "display": "block"});
+                                        dirRMenu.css({
+                                            "top": event.clientY - 10 + "px", 
+                                            "left": event.clientX + "px", 
+                                            "display": "block"
+                                        });
                                     }
                                 }
                             },
                             onClick: function(event, treeId, treeNode, clickFlag) {
-                                if (wide.curNode) {
-                                    var id = wide.curNode.tId;
-                                    if (id === treeNode.tId) {
-                                        // 再次点击当前选中节点
-                                        return false;
-                                    }
-
-
-                                    for (var i = 0, ii = editors.data.length; i < ii; i++) {
-                                        // 该节点文件已经打开
-                                        if (editors.data[i].id === treeNode.tId) {
-                                            editors.tabs.setCurrent(treeNode.tId);
-                                            wide.curNode = treeNode;
-                                            wide.curEditor = editors.data[i].editor;
-                                            return false;
-                                        }
-                                    }
-                                }
-
-                                wide.curNode = treeNode;
-
-                                if ("f" === treeNode.type) { // 如果单击了文件
-                                    var request = {
-                                        path: treeNode.path
-                                    };
-                                    $.ajax({
-                                        type: 'POST',
-                                        url: '/file',
-                                        data: JSON.stringify(request),
-                                        dataType: "json",
-                                        success: function(data) {
-                                            if (!data.succ) {
-                                                alert(data.msg);
-
-                                                return false;
-                                            }
-
-                                            if ("img" === data.mode) { // 是图片文件的话新建 tab 打开
-                                                // 最好是开 tab，但这个最终取决于浏览器设置
-                                                var w = window.open(data.path);
-
-                                                return false;
-                                            }
-
-                                            editors.newEditor(data);
-                                        }
-                                    });
-                                }
+                                tree._onClick(treeNode);
                             }
                         }
                     };
@@ -159,5 +120,55 @@ var tree = {
                 }
             }
         });
+    },
+    _onClick: function(treeNode) {
+        if (wide.curNode) {
+            var id = wide.curNode.tId;
+            if (id === treeNode.tId) {
+                // 再次点击当前选中节点
+                return false;
+            }
+
+
+            for (var i = 0, ii = editors.data.length; i < ii; i++) {
+                // 该节点文件已经打开
+                if (editors.data[i].id === treeNode.tId) {
+                    editors.tabs.setCurrent(treeNode.tId);
+                    wide.curNode = treeNode;
+                    wide.curEditor = editors.data[i].editor;
+                    return false;
+                }
+            }
+        }
+
+        wide.curNode = treeNode;
+
+        if ("f" === treeNode.type) { // 如果单击了文件
+            var request = {
+                path: treeNode.path
+            };
+            $.ajax({
+                type: 'POST',
+                url: '/file',
+                data: JSON.stringify(request),
+                dataType: "json",
+                success: function(data) {
+                    if (!data.succ) {
+                        alert(data.msg);
+
+                        return false;
+                    }
+
+                    if ("img" === data.mode) { // 是图片文件的话新建 tab 打开
+                        // 最好是开 tab，但这个最终取决于浏览器设置
+                        var w = window.open(data.path);
+
+                        return false;
+                    }
+
+                    editors.newEditor(data);
+                }
+            });
+        }
     }
 };
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