add linear_search in JS

codes/javascript/chapter_searching/linear_search.js

@@ -0,0 +1,48 @@
+/**
+ * File: linear-search.js
+ * Created Time: 2022-12-22
+ * Author: JoseHung (szhong@link.cuhk.edu.hk)
+ */
+
+const ListNode = require("../include/ListNode");
+
+/* 线性查找（数组） */
+function linearSearchArray(nums, target) {
+    // 遍历数组
+    for (let i = 0; i < nums.length; i++) {
+        // 找到目标元素，返回其索引
+        if (nums[i] === target) {
+            return i;
+        }
+    }
+    // 未找到目标元素，返回 -1
+    return -1; 
+}
+
+/* 线性查找（链表）*/
+function linearSearchLinkedList(head, target) {
+    // 遍历链表
+    while(head) {
+        // 找到目标结点，返回之
+        if(head.val === target) {
+            return head;
+        }
+        head = head.next;
+    }
+    // 未找到目标结点，返回 null
+    return null;
+}
+
+/* Driver Code */
+var target = 3;
+
+/* 在数组中执行线性查找 */
+var nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
+var index = linearSearchArray(nums, target);
+console.log("目标元素 3 的索引 = " + index);
+
+/* 在链表中执行线性查找 */
+var linkedList = new ListNode();
+var head = linkedList.arrToLinkedList(nums);
+var node = linearSearchLinkedList(head, target);
+console.log("目标结点值 3 的对应结点对象为 " + node);

docs/chapter_searching/linear_search.md

@@ -76,6 +76,18 @@ comments: true
 === "JavaScript"
 
     ```js title="linear_search.js"
+    /* 线性查找（数组） */
+    function linearSearchArray(nums, target) {
+        // 遍历数组
+        for (let i = 0; i < nums.length; i++) {
+            // 找到目标元素，返回其索引
+            if (nums[i] === target) {
+                return i;
+            }
+        }
+        // 未找到目标元素，返回 -1
+        return -1; 
+    }
 
     ```
 
@@ -167,7 +179,19 @@ comments: true
 === "JavaScript"
 
     ```js title="linear_search.js"
-
+    /* 线性查找（链表）*/
+    function linearSearchLinkedList(head, target) {
+        // 遍历链表
+        while(head) {
+            // 找到目标结点，返回之
+            if(head.val === target) {
+                return head;
+            }
+            head = head.next;
+        }
+        // 未找到目标结点，返回 null
+        return null;
+    }
     ```
 
 === "TypeScript"