CORS同源政策——JSONP跨域处理

2017-08-15  本文已影响0人  林立镇

llz.html

<h2>llz的网站</h2>

llj.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <h2>llj的网站</h2>
    <script type="text/javascript">
        window['llzUser'] = {}
        var script = document.createElement('script')
        script.src = 'http://llz.com/xxx.js?name=llzUser'
        //script下载的数据
        //  window['llzUser'] = ({
        //      "name":"llz",
        //      "age" : 23
        //  })
        //将替换window['llzUser']的值
        
        script.onload = function(){
            console.log('加载xxx.js 成功');
            console.log(window['llzUser'])
        }
        document.head.appendChild(script)
    </script>
</body>
</html>

xxx.js

//window['llzUser']
window['{{name}}'] = ({
    "name":"llz",
    "age" : 23
})

server.js

var http = require('http')
var fs = require('fs')
var url = require('url')

//console.log(Object.keys(http))
var port = process.env.PORT || 80;

var server = http.createServer(function(request, response){

  var temp = url.parse(request.url, true)
  var path = temp.pathname
  var query = temp.query
  var method = request.method

  if(path === '/'){  // 如果用户请求的是 / 路径
    var string = fs.readFileSync('./llz.html', 'utf8')  
    response.setHeader('Content-Type', 'text/html;charset=utf-8')  
    response.end(string)   
  }else if(path === '/llz'){  
    var string = fs.readFileSync('./llz.html', 'utf8')  
    response.setHeader('Content-Type', 'text/html;charset=utf-8')  
    response.end(string)   
  }else  if(path === '/llj'){  
    var string = fs.readFileSync('./llj.html', 'utf8')  
    response.setHeader('Content-Type', 'text/html;charset=utf-8')  
    response.end(string)   
  }else  if(path === '/xxx.js'){ 
    var name = query.name//llzUser
    var string = fs.readFileSync('./xxx.js','utf8') 
    response.setHeader('Access-Control-Allow-Origin','http://llj.com') 
    response.setHeader('Content-Type', 'text/javascript;charset=utf-8')
    response.end(string.replace('{{name}}',name))   
  }}else{  
    response.statusCode = 404
    response.setHeader('Content-Type', 'text/html;charset=utf-8') 
    response.end('找不到对应的路径,你需要自行修改 index.js')
  }

  console.log(method + ' ' + request.url)
})

server.listen(port)
console.log('监听 ' + port + ' 成功,请用在空中转体720度然后用电饭煲打开 http://llz.com:' + port)

在命令行运行(需要下载Node.js)

node server.js

在浏览器URL输入llj.com/llj网址,
网页向http://llz.com/xxx.js?name=llzUser请求脚本并发送请求参数,
server.js会获取请求参数name的值,然后替换xxx.js里的{{name}}字符串,
然后将替换后的内容返回给客户端,
会将页面javascript·里的window['llzUser']变量的值替换。
这里面既有跨域,又有回调函数。
回调函数的话,一般发送的参数名为callback=函数名

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