cors和jsonp的简单实现

<span style="font-family: Arial,Helvetica,sans-serif;"><!DOCTYPE html></span>

<html>

	<head>
		<meta charset="utf-8">
		<title></title>
	</head>

	<body>
	</body>
	<script>
		var xhr = new XMLHttpRequest();
		 //	xhr.onreadystatechange = function() {
		xhr.onload = function() {
		//	if (xhr.readyState == 4) {
				if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304) {
					alert(xhr.responseText);
				} else {
					alert(xhr.status)
				}
		//	}
		}
		xhr.open("get","http://127.0.0.1:3000/cors",true);
		xhr.send(null);

		function ok(data) {
			alert(data)
		}
		var script = document.createElement("script");
		var url = "http://127.0.0.1:3000?cb=ok";
		script.setAttribute("src",url);
		document.querySelector("head").appendChild(script)
	</script>

</html>

以上是前端的实现，后台用nodejs

var http = require("http");
var url=require("url");
var querystring=require("querystring");
http.createServer(function(req,res) {
	res.writeHead(200,{"Content-Type":"text/javascript","Access-Control-Allow-Origin":"http://127.0.0.1:8020"});
	if(url.parse(req.url).pathname=="/cors"){
		res.end("cors")
	}else{
		res.write(querystring.parse(url.parse(req.url).query)["cb"]+"('jsonp')")
	res.end()
	}
}).listen(3000);

cors和jsonp的简单实现

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