cors跨域（支持cookie跨域） node后台 express

app.all(‘*‘, function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "http://www.xxx.com"); 

　　res.header(‘Access-Control-Allow-Credentials: true‘); 　　//是否支持cookie跨域

　　res.header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");

　　res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS"); 

　　res.header("X-Powered-By",‘ 3.2.1‘) if(req.method=="OPTIONS") 

　　res.send(200);/*让options请求快速返回*/ else next(); 
})

var express = require(‘express‘)
var cors = require(‘cors‘)
var app = express()

app.use(cors())

var express = require(‘express‘)
var cors = require(‘cors‘)
var app = express()

app.get(‘/products/:id‘, cors(), function (req, res, next) {
  res.json({msg: ‘This is CORS-enabled for a Single Route‘})
})

app.use(cors({
　　　origin:[‘http://localhost:8080‘],//允许该域名下的请求
　　　methods:["GET","POST"],　　　　　　//　　允许接受的 请求类型
　　　alloweHeaders:[‘Conten-Type‘,‘Authorization‘,‘Accept‘,‘Origin‘],　　//请求头
　　　　exposeHeaders: [‘WWW-Authenticate‘, ‘Server-Authorization‘],
　　　　credentials: true, // 发送cookie
}));

前端用axios，需要设置一下cookie

axios.defaults.withCredentials = true  // axios请求携带cookie

this.$axios({
            xhrFields:{ withCredentials: true },//axios设置携带cookie
            method: ‘post‘,
            url: ‘http://localhost:3000/admin/add‘,
            data: param
          })
          .then((response)=>{
            console.log("sd");
            console.log(response.data.results);
          })
          .catch((err)=>{
                console.log("失败？");
                console.log(err);
          })