node js 框架 之 express 設置跨域問題 幾行代碼搞定

 

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");

res.header("X-Powered-By",' 3.2.1')

if(req.method=="OPTIONS") res.send(200);/*讓options請求快速返回*/

else next();

});