第一步：
index.html
<a data-toggle="modal" href="remote.html" data-target="#modal">Click me</a>
<div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modal">
<div class="modal-dialog" role="document">
<div class="modal-content">
//remote.html内容会被加载到这里
</div>
</div>
</div>
第二步：
新建remote.html
放入一下内容：
<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="exampleModalLabel">New message</h4>
</div>
<div class="modal-body">
<form>
<div class="form-group">
<label for="recipient-name" class="control-label">Recipient:</label>
<input type="text" class="form-control" id="recipient-name">
</div>
<div class="form-group">
<label for="message-text" class="control-label">Message:</label>
<textarea class="form-control" id="message-text"></textarea>
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Send message</button>
</div>

来自  http://wenda.bootcss.com/question/397