前端移除 lodash

@@ -10,13 +10,41 @@
 const $ = require('yoho-jquery');
 const Overlay = require('./overlay');
 const template = require('components/loading.hbs');
-const _ = require('lodash');
+
 const AJAX_LOADING_ENABLED = false; // 全局控制
 
 if (!Overlay) {
     throw new Error('Required dependency "Overlay" not found!');
 }
 
+/**
+ * 创建一个无抖动的函数
+ * @param  {[type]} func [description]
+ * @param  {[type]} wait [description]
+ * @param  {[type]} immediate [description]
+ * @return {[type]}
+ */
+function debounce(func, wait, immediate) {
+    let timeout;
+
+    return function() {
+        let context = this, args = arguments;
+        let later = function() {
+            timeout = null;
+            if (!immediate) {
+                func.apply(context, args);
+            }
+        };
+        let callNow = immediate && !timeout;
+
+        clearTimeout(timeout);
+        timeout = setTimeout(later, wait);
+        if (callNow) {
+            func.apply(context, args);
+        }
+    };
+}
+
 class Loading {
     constructor(opts) {
         this.defaults = {};
@@ -63,13 +91,13 @@ const instance = new Loading();
 
 if (AJAX_LOADING_ENABLED) {
     $(document).ajaxStart(()=> {
-        _.debounce(()=> {
+        debounce(()=> {
             instance.show();
         }, 100)();
     });
 
     $(document).ajaxStop(()=> {
-        _.debounce(()=> {
+        debounce(()=> {
             instance.hide();
         }, 500)();
     });