feat: add solution of Implement strStr()(028) with javascript

Author: taryn2016

README.md

@@ -36,7 +36,7 @@
 | [021][021-question] | [Merge Two Sorted Lists][021-tips]                           | [✅][021-java] | [✅][021-js] | [✅][021-kotlin] |
 | [026][026-question] | [Remove Duplicates from Sorted Array][026-tips]              | [✅][026-java] | [✅][026-js] | [✅][026-kotlin] |
 | [027][027-question] | [Remove Element][027-tips]                                   | [✅][027-java] | [✅][027-js] | [✅][027-kotlin] |
-| [028][028-question] | [Implement strStr()][028-tips]                               | [✅][028-java] |              | [✅][028-kotlin] |
+| [028][028-question] | [Implement strStr()][028-tips]                               | [✅][028-java] | [✅][027-js] | [✅][028-kotlin] |
 | [035][035-question] | [Search Insert Position][035-tips]                           | [✅][035-java] |              | [✅][035-kotlin] |
 | [038][038-question] | [Count and Say][038-tips]                                    | [✅][038-java] |              | [✅][038-kotlin] |
 | [053][053-question] | [Maximum Subarray][053-tips]                                 | [✅][053-java] |              | [✅][053-kotlin] |
@@ -358,6 +358,7 @@
 [021-js]: ./src/_021/Solution.js
 [026-js]: ./src/_026/Solution.js
 [027-js]: ./src/_027/Solution.js
+[028-js]: ./src/_028/Solution.js
 [226-js]: ./src/_226/Solution.js
 [561-js]: ./src/_561/Solution.js
 [643-js]: ./src/_643/Solution.js

src/_028/Solution.js

@@ -0,0 +1,20 @@
+/**
+ * @param {string} haystack
+ * @param {string} needle
+ * @return {number}
+ */
+var strStr = function(haystack, needle) {
+    if (haystack && needle) {
+        var x = haystack.split(needle)
+        if (x.length > 1) {
+            return x[0].length
+        } else {
+            return -1
+        }
+    } else if (haystack === '' && needle !== ''){
+        return -1
+    } else {
+        return 0
+    }
+
+};

tips/028/README.md

@@ -46,7 +46,7 @@ kotlin(200ms/87.50%):
 ```kotlin
 class Solution {
     fun strStr(haystack: String, needle: String): Int {
-        
+
         if (haystack.isEmpty()) {
             return if (needle.isEmpty()) haystack.length else -1
         }
@@ -85,7 +85,29 @@ class Solution {
     }
 }
 ```
+javascript:
+```javascript
+/**
+ * @param {string} haystack
+ * @param {string} needle
+ * @return {number}
+ */
+var strStr = function(haystack, needle) {
+    if (haystack && needle) {
+        var x = haystack.split(needle)
+        if (x.length > 1) {
+            return x[0].length
+        } else {
+            return -1
+        }
+    } else if (haystack === '' && needle !== ''){
+        return -1
+    } else {
+        return 0
+    }
 
+};
+```
 
 ## 结语