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新增724. 寻找数组的中心索引 JavaScript版本
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@ -129,6 +129,17 @@ func pivotIndex(nums []int) int {
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## JavaScript
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## JavaScript
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```js
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```js
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var pivotIndex = function(nums) {
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const sum = nums.reduce((a,b) => a + b);//求和
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// 中心索引左半和 中心索引右半和
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let leftSum = 0, rightSum = 0;
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for(let i = 0; i < nums.length; i++){
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leftSum += nums[i];
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rightSum = sum - leftSum + nums[i];// leftSum 里面已经有 nums[i],多减了一次,所以加上
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if(leftSum === rightSum) return i;
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}
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return -1;
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};
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```
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```
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-----------------------
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-----------------------
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