var user = document.getElementById('username')

var pws1 = document.getElementById('password')

var pws2 = document.getElementById('password-2')

var re = /^\w{3,10}$/

if ( !re.test(user.value)){

window.alert('账号必须是3到10位的数字或字母')

return false;

}

if(pws1.value!==pws2.value){

window.alert('两次输入的口令不一致')

return false;

}

return true

}