<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);
原文链接：https://www.f2er.com/json/289824.html