From 29ea3ad082fa189c35b259e50ffaf66f4adfd20a Mon Sep 17 00:00:00 2001
From: aouos <aouos@qq.com>
Date: Wed, 26 May 2021 10:00:14 +0800
Subject: [PATCH] =?UTF-8?q?0039.=E7=BB=84=E5=90=88=E6=80=BB=E5=92=8C?=
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---
 problems/0039.组合总和.md | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/problems/0039.组合总和.md b/problems/0039.组合总和.md
index e3e79295..0eba785f 100644
--- a/problems/0039.组合总和.md
+++ b/problems/0039.组合总和.md
@@ -292,7 +292,32 @@ class Solution:
 ```
 Go：
 
+JavaScript
+```js
+var strStr = function (haystack, needle) {
+  if (needle === '') {
+    return 0;
+  }
 
+  let hayslen = haystack.length;
+  let needlen = needle.length;
+
+  if (haystack === '' || hayslen < needlen) {
+    return -1;
+  }
+
+  for (let i = 0; i <= hayslen - needlen; i++) {
+    if (haystack[i] === needle[0]) {
+      if (haystack.substr(i, needlen) === needle) {
+        return i;
+      }
+    }
+    if (i === hayslen - needlen) {
+      return -1;
+    }
+  }
+};
+```
 
 
 -----------------------