Vue版不知道为什么总是打不开网页 about neteasemusic HOT 1 CLOSED

Access to XMLHttpRequest at 'http://localhost:3000/v1/personalized/djprogram' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

app.all('', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By", ' 3.2.1')
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
前后端都通了，看见后端有处理跨域问题，但前端加载后端数据还是提示存在跨域

from neteasemusic.