可能有些问题，你正在做，创建自己的小提琴，并在这里分享。
我使用你的代码，它的工作正常！我只是添加了模态和淡入淡出的类，它只打开，当我点击按钮

There might be something wrong you are doing, create your own fiddle and share it here.! I used your code, and its working fine! I just added the modal and fade classes to it, and it opens only when I click on the button

https://jsfiddle.net/happy2deepak/e5aukzge/

<button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Open Modal</button>
<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
    <div class="modal-dialog">
        <!-- Modal content-->
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                 <h4 class="modal-title">Modal Header</h4>

            </div>
            <div class="modal-body">
                <p>Some text in the modal.</p>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>