From c55dcda3e667aac0483b64a4a3699b55b4e84eec Mon Sep 17 00:00:00 2001
From: "luk.lu" <luk.lu@faronear.org>
Date: Tue, 9 Aug 2022 16:56:20 +0800
Subject: [PATCH] u

---
 coretool.js | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/coretool.js b/coretool.js
index d5791bf..71d850c 100644
--- a/coretool.js
+++ b/coretool.js
@@ -237,35 +237,32 @@ module.exports = {
 
   read_varchain (path, root) {
     let parent = root || globalThis || global || window || {}
-    let names = path.split('.')
-    for (var i in names) {
-      if (typeof parent === 'object' && names[i].match(/^\w+\(\)$/) && typeof parent[names[i].substring(0, names[i].length - 2)] === 'function') {
+    let keychain = path.split('.')
+    for (let key of keychain) {
+      if (typeof parent === 'object' && key.match(/^\w+\(\)$/) && typeof parent[key.substring(0, key.length - 2)] === 'function') {
         // 支持 xxx.myfunc().yyy 的函数形式作为一个路径节点。
-        parent = parent[names[i].substring(0, names[i].length - 2)]()
-      } else if (typeof parent === 'object' && names[i].match(/^\w+$/) && typeof parent[names[i]] != 'undefined' && parent[names[i]] != null) {
-        parent = parent[names[i]]
+        parent = parent[key.substring(0, key.length - 2)]()
+      } else if (typeof parent === 'object' && key.match(/^\w+$/) && typeof parent[key] != 'undefined' && parent[key] != null) {
+        parent = parent[key]
       } else {
         return undefined
       }
     }
-    if (parent === null || parent === undefined || isNaN(parent) || typeof parent === 'number') {
-      return undefined
-    }
     return parent
   },
 
   set_varchain (path, root, value) {
     var parent = root || global || window || {}
-    var names = path.split('.')
-    for (var i = 0; i < names.length - 1; i++) {
-      if (typeof parent === 'object' && names[i].match(/^\w+$/)) {
-        if (typeof parent[names[i]] !== 'object') parent[names[i]] = {}
-        parent = parent[names[i]]
+    var keychain = path.split('.')
+    for (let i = 0; i < keychain.length - 1; i++) {
+      if (typeof parent === 'object' && keychain[i].match(/^\w+$/)) {
+        if (typeof parent[keychain[i]] !== 'object') parent[keychain[i]] = {}
+        parent = parent[keychain[i]]
       } else {
         return null
       }
     }
-    return (parent[names[names.length - 1]] = value)
+    return (parent[keychain[keychain.length - 1]] = value)
   },
 
   /**