Sammy change context

     this.post('#/register', function (ctx) {

            let username = ctx.params.username
            let password = ctx.params.password
            let repeatPass = ctx.params.repeatPass
            console.log(username + ":" + repeatPass)
            if (username = '' || password == '') {
                alert('Username and password can not be empty!')
                ctx.redirect('#/index.html')
                return
            } else {
                if (password !== repeatPass) {
                    alert('Passwords do not match')
                    ctx.redirect('#/index.html')
                    return
                } else {
                    console.log(username  + ": " + password)
                    auth.register(ctx.username, password)
                    ctx.redirect('#/index.html')
                }
            }
        })