# 4)返回json视图

user/views.py

-from flask import url_for, render_template, make_response, redirect
+from flask import url_for, render_template, make_response, redirect, jsonify
 from flask import request
 
 from user import user_blu
@@ -73,3 +73,18 @@ def demo002():
 def demo003(user_id):
     print(user_id)
     return "hello"
+
+
+# 4)返回json
+@user_blu.route('/demo3')
+def demo3():
+    json_dict = {
+        "user_id": 10,
+        "user_name": "laowang"
+    }
+    #  json_str= json.dumps(json_dict )  # 没有指定content-type
+    #  return json_str
+
+    # 可以将字典转为json字符串,并且自动设置content-type为application/json
+    return jsonify(json_dict)
+    # return jsonify(user_id=10, user_name="laowang") # 也支持关键字实参形式