bootstrap 中的静态模式的控制按钮上的一个坑

在使用modal时发现，代码：<button class="btn btn-danger" data-toggle="modal" data-target="#myModal">删除</button>，button按钮点击没有反映，经过与自带的实例对比，发现一个区别，就是type="button"没有加，真是一个坑啊

<button class="btn btn-danger" type="button" data-toggle="modal" data-target="#myModal">删除</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                <h4 class="modal-title" id="myModalLabel">Modal title</h4>
            </div>
            <div class="modal-body">
                ...
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>