diff --git a/h5/snake/lib/utils/events.js b/h5/snake/lib/utils/events.js
index e6ed9bb..b21f5b6 100644
--- a/h5/snake/lib/utils/events.js
+++ b/h5/snake/lib/utils/events.js
@@ -8,56 +8,57 @@
 */
 
 export default class Events {
-	constructor() {
-		// 定义的事件与回调
-	    this.defineEvent = {}; 
-	}
-	// 注册事件
-	register(event, cb) { 
-		if(!this.defineEvent[event]) {
-			(this.defineEvent[event] = [cb]); 
-		}
-		else {
-			this.defineEvent[event].push(cb); 
-		} 
-	}
-	// 派遣事件
-	dispatch(event, arg) {
-		if(this.defineEvent[event]) {{
-            for(let i=0, len = this.defineEvent[event].length; i<len; ++i) { 
-                this.defineEvent[event][i] && this.defineEvent[event][i](arg); 
-            }
-        }}
-	}
-	// on 监听
-	on(event, cb) {
-		return this.register(event, cb); 
-	}
-	// off 方法
-    off(event, cb) {
-        if(this.defineEvent[event]) {
-            if(typeof(cb) == "undefined") { 
-                delete this.defineEvent[event]; // 表示全部删除 
-            } else {
-                // 遍历查找 
-                for(let i=0, len=this.defineEvent[event].length; i<len; ++i) { 
-                    if(cb == this.defineEvent[event][i]) {
-                        this.defineEvent[event][i] = null; // 标记为空 - 防止dispath 长度变化 
-                        // 延时删除对应事件
-                        setTimeout(() => this.defineEvent[event].splice(i, 1), 0); 
-                        break; 
-                    }
-                }
-            }
-        } 
+  constructor() {
+    // 定义的事件与回调
+    this.defineEvent = {};
+  }
+  // 注册事件
+  register(event, cb) {
+    if (!this.defineEvent[event]) {
+      this.defineEvent[event] = [cb];
+    } else {
+      this.defineEvent[event].push(cb);
     }
-
-    // once 方法，监听一次
-    once(event, cb) { 
-        let onceCb = () => {
-        	cb && cb(); 
-        	this.off(event, onceCb); 
+  }
+  // 派遣事件
+  dispatch(event, arg) {
+    if (this.defineEvent[event]) {
+      {
+        for (let i = 0, len = this.defineEvent[event].length; i < len; ++i) {
+          this.defineEvent[event][i] && this.defineEvent[event][i](arg);
+        }
+      }
+    }
+  }
+  // on 监听
+  on(event, cb) {
+    return this.register(event, cb);
+  }
+  // off 方法
+  off(event, cb) {
+    if (this.defineEvent[event]) {
+      if (typeof cb == "undefined") {
+        delete this.defineEvent[event]; // 表示全部删除
+      } else {
+        // 遍历查找
+        for (let i = 0, len = this.defineEvent[event].length; i < len; ++i) {
+          if (cb == this.defineEvent[event][i]) {
+            this.defineEvent[event][i] = null; // 标记为空 - 防止dispath 长度变化
+            // 延时删除对应事件
+            setTimeout(() => this.defineEvent[event].splice(i, 1), 0);
+            break;
+          }
         }
-        this.register(event, onceCb); 
+      }
     }
-}
\ No newline at end of file
+  }
+
+  // once 方法，监听一次
+  once(event, cb) {
+    let onceCb = () => {
+      cb && cb();
+      this.off(event, onceCb);
+    };
+    this.register(event, onceCb);
+  }
+}