nodejs中ajax跨域和jsonp跨域

2024年4月30日 177次阅读 来源: potato1314

JSONP跨域获取数据

1.前端代码：

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<button id="get" >异步获取数据</button>
<script src="js/des/jquery-2.2.4.js"></script>
<script>
    var log=function (obj) {
        console.log(obj);
    }
    var get=document.getElementById('get');
    get.addEventListener('click',function () {
        $.getJSON('http://192.168.0.250:9000/bannerUrl?callback=?',function (data) {
            log('result data:'+data.name);
        });

    },false);


</script>
</body>
</html>

2.nodejs代码

var express = require('express');
var router = express.Router();
var urllib=require('url');

//获取banner url
router.get('/bannerUrl',function (req,res,next) {
  var data = {'name': 'jifeng', 'company': 'taobao'};
  var params=urllib.parse(req.url,true);
  //console.log('请求1:'+params);
  if (params.query && params.query.callback) {
    //console.log('请求2:'+params.query);
    var str =  params.query.callback + '(' + JSON.stringify(data) + ')';//jsonp
    res.send(str);
  } else {
    res.send(JSON.stringify(data));//普通的json
  }
});

POST跨域获取数据

1.前端代码

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<button id="get" >异步获取数据</button>
<script>
    var log=function (obj) {
        console.log(obj);
    }
    var get=document.getElementById('get');
    get.addEventListener('click',function () {

        var xhr=new XMLHttpRequest();
        xhr.onload=function () {
            log(this.responseText);
        }
        xhr.open('post','http://192.168.0.250:9000/bannerUrl',true);
        xhr.send();
    },false);


</script>
</body>
</html>

2.nodejs代码：

//获取banner url
router.post('/bannerUrl',function (req,res,next) {
  res.setHeader('Access-Control-Allow-Origin','http://192.168.0.250:3001');
  res.send({name:'wzh'});

});

Nodejs解决所有跨域请求

1.nodejs code:

app.use(function(req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST');
  res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type, Authorization');
  next();
});
    原文作者：potato1314
    原文地址: https://segmentfault.com/a/1190000005985271
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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