Add Solution JavaScript

Author: WANGZijian1994

June-LeetCoding-Challenge/04-Reverse-String/Reverse-String.js

@@ -0,0 +1,16 @@
+/**
+ * @param {character[]} s
+ * @return {void} Do not return anything, modify s in-place instead.
+ */
+var reverseString = function(s) {
+    var i = 0;
+    var j = s.length-1;
+    while(i<j){
+        let tmp = s[i];
+        s[i]=s[j];
+        s[j]=tmp;
+        i++;
+        j--;
+    }
+    return s;
+};