app.all('*',function(req,res,next)) -->* 代表所有訪問 脚猾，
? res.header('Access-Control-Allow-Origin', '*');? ---->代表同意跨域
? res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With ');? ------>代表支付HTTP頭字段
? res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');? ------>代表支持的HTTP方法
//跨域訪問
app.all('*',function (req, res, next) {
? res.header('Access-Control-Allow-Origin', '*');
? res.header('Access-Control-Allow-Headers', 'Accept,Content-Type,Content-Length, Authorization,X-Requested-With ');
? res.header('Access-Control-Allow-Methods', 'POST,GET,PUT,DELETE,OPTIONS');
? if ('OPTIONS' == req.method) {
? ? res.send(200); /讓options請求快速返回/
? }
? else {
? ? next();
? }
});
開戶跨域訪問,必需放在路由前執(zhí)行，不然不會生效
app.all('*',function (req, res, next) {
? res.header('Access-Control-Allow-Origin', '*');
? res.header('Access-Control-Allow-Headers', 'Accept,Content-Type,Content-Length, Authorization,X-Requested-With ');
? res.header('Access-Control-Allow-Methods', 'POST,GET,PUT,DELETE,OPTIONS');
? if ('OPTIONS' == req.method) {
? ? res.send(200); /讓options請求快速返回/
? }
? else {
? ? next();
? }
});
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/admin',adminRouter);
