今天给大家分享一款轻量级Modal模态框插件cta.js。这是一款无需使用jQuery插件，纯js编写的模态框弹出特效。效果图如下：

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实现的代码。

html代码：

<section class="section--white" style="margin-top: 40px;">
	<div class="tile-container">
		<div class="tile" data-cta-target=".js-modal-1"></div>
		<div class="tile" data-cta-target=".js-modal-2"></div>
		<div class="tile" data-cta-target=".js-modal-3"></div>
		<div class="tile" data-cta-target=".js-modal-4"></div>
		<div class="tile" data-cta-target=".js-modal-5" style="width: 16.666%"></div>
		<div class="tile" data-cta-target=".js-modal-3"></div>
		<div class="tile" data-cta-target=".js-modal-5" style="width: 16.666%"></div>
	</div>
</section>
    <section class="section--white">
	<p>Opening modals on button clicks</p>
	<div class="btn" data-cta-target=".js-dialog" style="background: #4A90E2">Click for awesomeness</div>
</section>
    <section class="section--white">
	<p>Opening sidebars</p>
	<div class="btn" data-cta-target=".js-sidebar">Open the Sidebar</div>
</section>
    <section class="section--white">
	 <script src="http://www.w2bc.com/scripts/2bc/_gg_980_90.js" type="text/javascript"></script>

</section>
    <div class="js-modal-1  modal  modal--1">
        <span class="modal-close-btn"></span>
        <h1>
            Visual Continuity</h1>
        <div class="quote-box">
            <div class="quote-box__bubble">
                Transitioning between two visual states should be clear, smooth and effortless and
                not confuse the user. A well-designed transition does the heavy lifting and enables
                the user to clearly understand where their attention should be focused.</div>
        </div>
    </div>
    <div class="js-modal-2  modal  modal--2">
        <span class="modal-close-btn"></span>
        <h1>
            Share it if you like it</h1>
    </div>
    <div class="js-modal-3  modal  modal--3">
        <span class="modal-close-btn"></span>
        <h1>
            Customary cat!</h1>
        <img src="img/cat.jpg" width="300" alt="">
        <p>
            You found me :)</p>
    </div>
    <div class="js-modal-4  modal  modal--4">
        <span class="modal-close-btn"></span>
        <h1>
            Hierarchical timing</h1>
        <div class="quote-box">
            <div class="quote-box__bubble">
                When building a transition, consider the order and timing of the elements' movement.
                Ensure that motion supports the information hierarchy, conveying what content is
                most important by creating a path for the eye to follow.</div>
        </div>
    </div>
    <div class="js-modal-5  modal  modal--5">
        <span class="modal-close-btn"></span>
        <h1>
            Consistent choreography</h1>
        <div class="quote-box">
            <div class="quote-box__bubble">
                A well-choreographed app also provides teachable moments. When transitioning elements
                are coordinated, the user's understanding of the app grows. They "get" the app;
                they don't feel disoriented by the animation.</div>
        </div>
    </div>
    <div class="js-dialog  modal  dialog" style="text-align: center;">
        <span class="modal-close-btn"></span>
        <h3>
            Do you think this is Awesome?</h3>
        <br>
        <a onclick="closeShowingModal(true); return;" class="btn  btn--blue">Yes</a> <a onclick="closeShowingModal(false); return;"
            class="btn  btn--blue">No</a>
    </div>
    <div class="js-sidebar  modal sidebar">
        <span class="modal-close-btn"></span>
        <div class="sidebar__block" style="height: 20%">
        </div>
        <div class="sidebar__block" style="height: 40%">
        </div>
        <div class="sidebar__block" style="height: 10%">
        </div>
    </div>

js代码：

  var closeFn;
        function closeShowingModal(liked) {
            if (liked !== undefined) {
                _gaq.push(['_trackEvent', 'ctajs', liked ? 'liked' : 'unliked']);
            }
            var showingModal = document.querySelector('.modal.show');
            if (!showingModal) return;
            showingModal.classList.remove('show');
            document.body.classList.remove('disable-mouse');
            if (closeFn) {
                closeFn();
                closeFn = null;
            }
        }
        document.addEventListener('click', function (e) {
            var target = e.target;
            if (target.dataset.ctaTarget) {
                _gaq.push(['_trackEvent', 'ctajs', 'modal']);
                closeFn = cta(target, document.querySelector(target.dataset.ctaTarget), { relativeToWindow: true }, function showModal(modal) {
                    modal.classList.add('show');
                    document.body.classList.add('disable-mouse');
                });
            }
            else if (target.classList.contains('modal-close-btn')) {
                closeShowingModal();
            }
        });
        document.addEventListener('keyup', function (e) {
            if (e.which === 27) {
                closeShowingModal();
            }
        })

        var _gaq = _gaq || [];

via：http://www.w2bc.com/Article/36596

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