feat: add typescript solution to lc problem: No.1903.Largest Odd Number in String (doocs#461)

Author: zhaocchen

solution/1900-1999/1903.Largest Odd Number in String/README.md

@@ -85,6 +85,24 @@ class Solution {
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {string} num
+ * @return {string}
+ */
+ var largestOddNumber = function(num) {
+    let n = num.length;
+    for (let j = n - 1; j >= 0; j--) {
+        if (num.charAt(j) & 1 == 1) {
+            return num.slice(0, j+1);
+        }
+    }
+    return '';
+};
+```
+
 ### **C++**
 
 ```cpp

solution/1900-1999/1903.Largest Odd Number in String/README_EN.md

@@ -73,6 +73,24 @@ class Solution {
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {string} num
+ * @return {string}
+ */
+ var largestOddNumber = function(num) {
+    let n = num.length;
+    for (let j = n - 1; j >= 0; j--) {
+        if (num.charAt(j) & 1 == 1) {
+            return num.slice(0, j+1);
+        }
+    }
+    return '';
+};
+```
+
 ### **C++**
 
 ```cpp

solution/1900-1999/1903.Largest Odd Number in String/Solution.js

@@ -0,0 +1,13 @@
+/**
+ * @param {string} num
+ * @return {string}
+ */
+ var largestOddNumber = function(num) {
+    let n = num.length;
+    for (let j = n - 1; j >= 0; j--) {
+        if (num.charAt(j) & 1 == 1) {
+            return num.slice(0, j+1);
+        }
+    }
+    return '';
+};