node+express解决前端跨域问题

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var express = require('express')   , app = express();   //解决跨域 app.all('*',function (req, res, next) {   res.header('Access-Control-Allow-Origin', '*');   res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With');   res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');   if (req.method == 'OPTIONS') {     res.send(200);   }   else {     next();   } }); var server = app.listen(8081, function () {   var host = server.address().address   var port = server.address().port   console.log("应用实例，访问地址为 http://%s:%s", host, port)    })