初识bootstrap

1，html页面中添加引用<link rel="stylesheet" href="img/bootstrap.min.css" />

<div class="container">
    <nav class="navbar navbar-default" role="navigation">
        <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse"
                        data-target="#bs-example-navbar-collapse-1">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="#">Brand</a>
            </div>

            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">Link</a></li>
                    <li><a href="#">Link</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Action</a></li>
                            <li><a href="#">Another action</a></li>
                            <li><a href="#">Something else here</a></li>
                            <li class="divider"></li>
                            <li><a href="#">Separated link</a></li>
                            <li class="divider"></li>
                            <li><a href="#">One more separated link</a></li>
                        </ul>
                    </li>
                </ul>
                <form class="navbar-form navbar-left" role="search">
                    <div class="form-group">
                        <input type="text" class="form-control" placeholder="Search">
                    </div>
                    <button type="submit" class="btn btn-default">Submit</button>
                </form>

            </div>
            <!-- /.navbar-collapse -->
        </div>
        <!-- /.container-fluid -->
    </nav>


    <div class="row">
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
    </div>
    <div class="row">
        <div class="col-md-8">.col-md-8</div>
        <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
        <div class="col-md-4">.col-md-4</div>
        <div class="col-md-4">.col-md-4</div>
        <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
        <div class="col-md-6">.col-md-6</div>
        <div class="col-md-6">.col-md-6</div>
    </div>
    <form role="form">
        <div class="form-group">
            <label for="exampleInputEmail1">Email address</label>
            <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email">
        </div>
        <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
        </div>
        <div class="form-group">
            <label for="exampleInputFile">File input</label>
            <input type="file" id="exampleInputFile">

            <p class="help-block">Example block-level help text here.</p>
        </div>
        <div class="checkbox">
            <label>
                <input type="checkbox"> Check me out
            </label>
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
    </form>

</div>

<style type="text/css">
           .row{
    margin-bottom: 20px;
}

.row .row{
    margin-top: 10px;
    margin-bottom: 0px;
}
[class*="col-"]{
    padding-top: 15px;
    padding-bottom: 15px;
    background-color: #eee;
    background-color: rgba(86,61,124,.15);
    border: 1px solid #dddddd;
    border: 1px solid rgba(86,61,124,.2);
}
        </style>