feat: add js solution to lc problem: No.0137

Author: rain84

solution/0100-0199/0137.Single Number II/README.md

@@ -332,6 +332,22 @@ function singleNumber(nums: number[]): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function singleNumber(nums) {
+    let a = 0;
+    let b = 0;
+    for (const c of nums) {
+        const aa = (~a & b & c) | (a & ~b & ~c);
+        const bb = ~a & (b ^ c);
+        a = aa;
+        b = bb;
+    }
+    return b;
+}
+```
+
 #### Rust
 
 ```rust

solution/0100-0199/0137.Single Number II/README_EN.md

@@ -323,6 +323,22 @@ function singleNumber(nums: number[]): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function singleNumber(nums) {
+    let a = 0;
+    let b = 0;
+    for (const c of nums) {
+        const aa = (~a & b & c) | (a & ~b & ~c);
+        const bb = ~a & (b ^ c);
+        a = aa;
+        b = bb;
+    }
+    return b;
+}
+```
+
 #### Rust
 
 ```rust

solution/0100-0199/0137.Single Number II/Solution2.js

@@ -0,0 +1,11 @@
+function singleNumber(nums) {
+    let a = 0;
+    let b = 0;
+    for (const c of nums) {
+        const aa = (~a & b & c) | (a & ~b & ~c);
+        const bb = ~a & (b ^ c);
+        a = aa;
+        b = bb;
+    }
+    return b;
+}