var db_options={ host:’localhost’, port : 3308, user : 'root’, password : ‘’, database:’mysql’ } var mq = require(“mysql”); var mc = mq.createConnection(db_options); mc.connect();

exports.getName = function(req, res) { var username = req.body[“name”];

var sql = "select name from `user` where name = " + username;

mc.query(sql, function(err, rs, fields){
        mc.end(); 
        mc.destroy()
        var info="123";
        if(err){
            info = "系统异常";
            mc.end(); 
            mc.destroy()
            
        } 
        console.log(info);
        console.log(rs);
        res.write(JSON.stringify(rs));
        //console.log(JSON.stringify(rs));
        
});

};

我只是想写 用户名重复验证 $.ajax() 为什么会出现这样的问题！