JavaScript - Making Decisions(Password Validation)

Exercises for Programmers

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• JavaScript (プログラミング言語)
• jQuery (Library)
• Safari(Web browser)

Exercises for Programmers: 57 Challenges to Develop Your Coding Skills (Brian P. Hogan 著、Pragmatic Bookshelf)のChapter 4(Making Decisions)、15(Password Validation)を取り組んでみる。

15(Password Validation)

コード(Emacs)

<label for="password0">
  What is the password? 
</label>
<input id="password0" type="password" >
<br>
<span id="answer0"></span>

<script src="sample15.js"></script>

(function () {
    'use strict';
    var password = 'abc$123',
        input_password = document.querySelector('#password0'),
        span_answer = document.querySelector('#answer0'),
        display;

    display = function () {
        var pass = input_password.value,
            answer;

        if (pass === password) {
            answer = 'Welcom!'
        } else {
            answer = "I don't know you."        
        }
        span_answer.innerText = answer;
    };

    input_password.onblur = display;
}());

What is the password?