From 47113e7545c749464a9af7b819d01016ce2ff91b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B3=A2=E6=AF=94=E5=B0=8F=E9=87=91=E5=88=9A?=
 <2890636389@qq.com>
Date: Mon, 27 May 2019 20:57:17 +0800
Subject: [PATCH] maybe u don't want to just delete the last one.

thx, this is a great repo.

i think, there may be should have a condition: `this.container.watchers.splice(index, 1);` otherwise, it's just delete the last wather.
---
 src/watcher.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/watcher.js b/src/watcher.js
index 4125ee9..c4b2d10 100644
--- a/src/watcher.js
+++ b/src/watcher.js
@@ -214,7 +214,9 @@ ElementWatcher.prototype = {
 	destroy: function() {
 		var index = this.container.watchers.indexOf(this),
 			self  = this;
-		this.container.watchers.splice(index, 1);
+		if (index !== -1) {
+			this.container.watchers.splice(index, 1);
+		}
 		for (var i = 0, j = eventTypes.length; i < j; i++) {
 			self.callbacks[eventTypes[i]].length = 0;
 		}