跨域

1.简单跨域

从http://127.0.0.1:8001/向http://127.0.0.1:8002/获取数据

在http://127.0.0.1:8001/中

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
 7 </head>
 8 <body>
 9 <h2>s1页面</h2>
10 <button id="get">获取s2的数据</button>
11 <script>
12     $("#get").click(function () {
13         $.ajax({
14             url:"http://127.0.0.1:8002/sendmsg/",
15             success:function (ret) {
16                 console.log(ret)
17             }
18         })
19     })
20 </script>
21 </body>
22 </html>

在http://127.0.0.1:8002/中

1 from django.shortcuts import render,HttpResponse
2 def sendmsg(request):
3     list=["amy","lucy","amily"]
4     import json
5     ret=HttpResponse(json.dumps(list))
6     #核心代码设置请求头中的Access-Control-Allow-Origin为*(所有)或http://127.0.0.1:8001/
7     ret['Access-Control-Allow-Origin']="*"
8     return ret

2.复杂跨域

http://127.0.0.1:8001/向http://127.0.0.1:8002/获发送json数据数据

在http://127.0.0.1:8001/中

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
 7 </head>
 8 <body>
 9 <h2>s1页面</h2>
10 <button id="get">获取s2的数据(复杂)</button>
11 <button id="easy">获取s2的数据(简单)</button>
12 <script>
13     $("#get").click(function () {
14         $.ajax({
15             url:"http://127.0.0.1:8002/sendmsg/",
16             type:"post",
17             contentType:"json",
18             data:JSON.stringify(["aaa","bbb"]),
19             success:function (ret) {
20                 console.log(ret)
21             }
22         })
23     })
24     $("#easy").click(function () {
25         $.ajax({
26             url:"http://127.0.0.1:8002/sendmsg/",
27             success:function (ret) {
28                 console.log(ret)
29             }
30         })
31     })
32 </script>
33 </body>
34 </html>

在http://127.0.0.1:8002/中

 1 from django.shortcuts import render,HttpResponse
 2 def sendmsg(request):
 3     list=["amy","lucy","amily"]
 4     import json
 5     ret=HttpResponse(json.dumps(list))
 6     ret['Access-Control-Allow-Origin']="*"
 7     #核心代码
 8     ret["Access-Control-Allow-Headers"]="Content-Type"
 9     if request.method=="POST":
10         #前端传递过来的json数据
11         print(request.body)
12     return ret

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原文地址：https://www.cnblogs.com/shanghongyun/p/10062425.html