Express框架Restful API Ajax 跨域 开启Cookie支持

前端（Jquery Ajax）：

 1 $.ajax({
 2     url: "http://localhost/api/test/",
 3     type: "POST",
 4     xhrFields: {
 5         withCredentials: true //必须添加
 6     },
 7     crossDomain: true, //必须添加
 8     success: function (data) {
 9         alert(data);
10     }
11 });

Node.js：

1.Cookie操作库（cookie.js）：

 1 'use strict';
 2 //依赖 cookie-parser 模块
 3 
 4 var cookieParser = require('cookie-parser');
 5 var config = {
 6     isUseCookieSign:false, //是否使用cookie加密
 7     sign:'cookieSecret', //cookie加密字符
 8     maxAge:900000 //cookie失效时间
 9 };
10 
11 exports.initCookie = function(app){
12     //如果开启cookie加密
13     if(config.isUseCookieSign){
14         app.use(cookieParser(config.sign));
15     } else{
16         app.use(cookieParser());
17     }
18 
19 }
20 //设置cookie
21 exports.setCookie = function(res,key,value){
22     res.cookie(key, value, {
23         maxAge: config.maxAge,
24         httpOnly: true,
25         //只允许在https协议下传输cookie
26         // secure:true,
27         signed: config.isUseCookieSign
28     });
29 }
30 //获取cookie
31 exports.getCookie = function(req,key){
32     if(config.isUseCookieSign){
33         if(req.signedCookies[key] === undefined){
34             return null;
35         } else{
36             return req.signedCookies[key];
37         }
38 
39     } else{
40         if(req.cookies[key] === undefined){
41             return null;
42         } else{
43             return req.cookies[key];
44         }
45 
46     }
47 }
48 //删除cookie
49 exports.delCookie = function(res,key){
50     res.clearCookie(key);
51 }

2.启动时绑定中间件

require('./lib/cookie').initCookie(app);

3.接口调用处理cookie

 1 'use strict';
 2 var cookie = require('../../lib/cookie'); //cookie库引用
 3 
 4 exports.bind = function (app, preUrl) {
 5 
 6     app.post(preUrl+'/',function(req,res,next){
 7         //获取cookie
 8         console.log(cookie.getCookie(req,'name'));
 9         //设置cookie
10         cookie.setCookie(res,'name','xjytest');
11         res.send('OK');
12     })
13 
14 }    

通过以上设置，Express Restful API 可以自由的设置和调用前端的cookie了。