今天在用ajax交互数据时遇见了这样的问题

经过百度发现:
只要在nodejs加上express框架,在服务器代码文件中加入下面的跨域允许权限,即可解决问题
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();
});