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来了

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//获取元素与属性值

var user = document.getElementById('username');

var username = user.value;

var pswd1 = document.getElementById('password');

var p1 = pswd1.value;

var pswd2 = document.getElementById('password-2');

var p2 = pswd2.value;

//建立正则表达式

var re1 = /[0-9a-zA-Z\_]{2,11}/ ;

var re1 = /{5,21}/ ;

    if(re1.test(user)===true){

      if(re2.test(pswd1)===true){

        if(re2.test(pswd2)===true){

          if(pswd1 === pswd2){

            return true;

          }

        }

      }

    }

    return false;

}


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