跨域允许的请求方式
res.header("Access-Control-Allow-Methods","DELETE,PUT,POST,GET,OPTIONS");
if (req.method.toLowerCase...else
next();
}
设置允许多个域名跨域:
app.all("*",function(req,res,next){
if( req.headers.origin.toLowerCase...() == "http://www.zhangpeiyue.com"
|| req.headers.origin.toLowerCase() =="http://127.0.0.1" )...res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
if (req.method.toLowerCase...http://www.qq.com",
"http://www.baidu.com"
]
if(orginList.includes(req.headers.origin.toLowerCase