From 0a1a911c344e8f9b283370b9a9d0c37312a42ce8 Mon Sep 17 00:00:00 2001
From: harveyshao <harveyshao@tencent.com>
Date: Tue, 15 Mar 2022 03:29:35 +0800
Subject: [PATCH] opt iml

---
 lib/core.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/core.js b/lib/core.js
index ad4d6e3b..e7fe003e 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -140,9 +140,9 @@ Volcanos("core", {help: "数据结构",
 		return list
 	}),
 	ItemSort: shy("迭代器", function(obj, key, cb) { var list = []
-		var order = [], keys = {}, vals = {}
-		for (var k in obj) { order.push(obj[k][key])
-			keys[obj[k][key]] = k, vals[obj[k][key]] = obj[k]
+		var order = [], keys = {}, vals = {}, i = 0
+		for (var k in obj) { o = obj[k][key]||i++
+			order.push(o), keys[o] = k, vals[o] = obj[k]
 		}; order.sort()
 
 		for (var i in order) { var k = order[i]