Express 解决跨域请求

在app.js中配置跨域请求

//设置允许跨域访问该服务. app.use((req, res, next) => { res.set({ 'Access-Control-Allow-Credentials': true, 'Access-Control-Max-Age': 1728000, 'Access-Control-Allow-Origin': req.headers.origin || '*', 'Access-Control-Allow-Headers': 'X-Requested-With,Content-Type', 'Access-Control-Allow-Methods': 'PUT,POST,GET,DELETE,OPTIONS', 'Content-Type': 'application/json; charset=utf-8' }) req.method === 'OPTIONS' ? res.status(204).end() : next() })