From c99a153c01d14b50ce1108ee5fecab4418b563b4 Mon Sep 17 00:00:00 2001
From: Qi Jia <13632059+jackeyjia@users.noreply.github.com>
Date: Mon, 5 Jul 2021 15:02:52 -0700
Subject: [PATCH] add js solution for findTargetSumWays

---
 problems/0494.目标和.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/problems/0494.目标和.md b/problems/0494.目标和.md
index a0e07a1f..b7da0252 100644
--- a/problems/0494.目标和.md
+++ b/problems/0494.目标和.md
@@ -306,6 +306,36 @@ func findTargetSumWays(nums []int, target int) int {
 }
 ```
 
+Javascript：
+```javascript
+const findTargetSumWays = (nums, target) => {
+
+    const sum = nums.reduce((a, b) => a+b);
+    
+    if(target > sum) {
+        return 0;
+    }
+
+    if((target + sum) % 2) {
+        return 0;
+    }
+
+    const halfSum = (target + sum) / 2;
+    nums.sort((a, b) => a - b);
+
+    let dp = new Array(halfSum+1).fill(0);
+    dp[0] = 1;
+
+    for(let i = 0; i < nums.length; i++) {
+        for(let j = halfSum; j >= nums[i]; j--) {
+            dp[j] += dp[j - nums[i]];
+        }
+    }
+
+    return dp[halfSum];
+};
+```
+
 
 
 -----------------------