获取元素改用jquery的写法

docs/chapter03.md

@@ -83,6 +83,7 @@ doSomethingAsync((result1) => {
 
 ##### 3.3.1.2 Promise对象
 [Promise 10分钟，理论+实操](https://www.bilibili.com/video/BV1yu4y1H7ET/?spm_id_from=333.337.search-card.all.click&vd_source=fb252f6c305362a2870fb7388465df99)
+
 [最好理解的Promise教程](https://www.bilibili.com/video/BV1454y1R7vj?p=1)
 
 [异步编程: 一次性搞懂 Promise, async, await (#js #javascript)](https://www.bilibili.com/video/BV1WP4y187Tu/?spm_id_from=333.337.search-card.all.click&vd_source=fb252f6c305362a2870fb7388465df99)
@@ -266,7 +267,7 @@ async function example() {
     }).catch(error => {
       // 处理任何发生的错误
       console.error('There has been a problem with your fetch operation:', error);
-    });
+    }); 
 ```
 代码解释：
 >
@@ -317,8 +318,8 @@ async function example() {
       console.log('Data received:', data);
       console.log('Text Status:', textStatus);
       console.log('jqXHR:', jqXHR);
-      document.getElementById("title").innerHTML = data.title;
+      $("#title").html(data.title);
-      document.getElementById("content").innerHTML = data.body;
+      $("#content").html(data.body);
     }).fail(function(jqXHR, textStatus, errorThrown) {
       console.error('Request failed:', textStatus, errorThrown);
     });
@@ -331,8 +332,8 @@ async function example() {
         console.log('Data received:', data);
         console.log('Text Status:', textStatus);
         console.log('jqXHR:', jqXHR);
-        document.getElementById("title2").innerHTML = data.title;
+        $("#title2").html(data.title);
-        document.getElementById("content2").innerHTML = data.body;
+        $("#content2").html(data.body);
       },
       error: function(jqXHR, textStatus, errorThrown) {
         console.error('Request failed:', textStatus, errorThrown);

examples/chapter03/jquery.html

@@ -23,8 +23,8 @@
         console.log('Data received:', data);
         console.log('Text Status:', textStatus);
         console.log('jqXHR:', jqXHR);
-        document.getElementById("title").innerHTML = data.title;
+        $("#title").html(data.title);
-        document.getElementById("content").innerHTML = data.body;
+        $("#content").html(data.body);
     }).fail(function(jqXHR, textStatus, errorThrown) {
         console.error('Request failed:', textStatus, errorThrown);
     });
@@ -37,8 +37,8 @@
             console.log('Data received:', data);
             console.log('Text Status:', textStatus);
             console.log('jqXHR:', jqXHR);
-            document.getElementById("title2").innerHTML = data.title;
+            $("#title2").html(data.title);
-            document.getElementById("content2").innerHTML = data.body;
+            $("#content2").html(data.body);
         },
         error: function(jqXHR, textStatus, errorThrown) {
             console.error('Request failed:', textStatus, errorThrown);