在此插入代码var name = document.getElementById("username");
var password1 = document.getElementById("password");
var password2 = document.getElementById("password-2");

var testName = '[0-9a-zA-Z]{3, 10}'
var testPassword = '[0-9a-zA-Z]{6, 20}';

if(testName.test(name.value) !== true)
      return false;
if(password1.value !== password2.value)
      return false;
if(testPassword.test(password1) !== true)
      return false;
return true;
}