修改 0704 二分查找 JavaScript版本 左闭右闭区间 解法

problems/0704.二分查找.md

@@ -288,15 +288,16 @@ func search(nums []int, target int) int {
  * @param {number} target
  * @return {number}
  */
+/**
 var search = function(nums, target) {
-    let left = 0, right = nums.length;
-    // 使用左闭右开区间 [left, right)
-    while (left < right) {
+    let left = 0, right = nums.length - 1;
+    // 使用左闭右闭区间
+    while (left <= right) {
         let mid = left + Math.floor((right - left)/2);
         if (nums[mid] > target) {
-            right = mid;  // 去左区间寻找
+            right = mid - 1;  // 去左面闭区间寻找
         } else if (nums[mid] < target) {
-            left = mid + 1;   // 去右区间寻找
+            left = mid + 1;   // 去右面闭区间寻找
         } else {
             return mid;
         }