From 8edca00e487878a00b16a296b35ff9a14fb3cb2f Mon Sep 17 00:00:00 2001
From: jerryfishcode <91447694+jerryfishcode@users.noreply.github.com>
Date: Mon, 27 Sep 2021 20:37:23 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9E724.=20=E5=AF=BB=E6=89=BE?=
 =?UTF-8?q?=E6=95=B0=E7=BB=84=E7=9A=84=E4=B8=AD=E5=BF=83=E7=B4=A2=E5=BC=95?=
 =?UTF-8?q?=20JavaScript=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
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---
 problems/0724.寻找数组的中心索引.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/problems/0724.寻找数组的中心索引.md b/problems/0724.寻找数组的中心索引.md
index 991ce647..d5fa48ee 100644
--- a/problems/0724.寻找数组的中心索引.md
+++ b/problems/0724.寻找数组的中心索引.md
@@ -129,6 +129,17 @@ func pivotIndex(nums []int) int {
 ## JavaScript
 
 ```js
+var pivotIndex = function(nums) {
+    const sum = nums.reduce((a,b) => a + b);//求和
+    // 中心索引左半和 中心索引右半和
+    let leftSum = 0, rightSum = 0;
+    for(let i = 0; i < nums.length; i++){
+        leftSum += nums[i];
+        rightSum = sum - leftSum + nums[i];// leftSum 里面已经有 nums[i]，多减了一次，所以加上
+        if(leftSum === rightSum) return i;
+    }
+    return -1;
+};
 ```
 
 -----------------------