单个标签实现分隔线:

 

点此查看实例展示

 

.demo_line_01{
    padding: 0 20px 0;
    margin: 20px 0;
    line-height: 1px;
    border-left: 200px solid #ddd;
    border-right: 200px solid #ddd;
    text-align: center;
}

优点:代码简洁

巧用背景色实现分隔线:

 

点此查看实例展示

 

.demo_line_02{
    height: 1px;
    border-top: 1px solid #ddd;
    text-align: center;
}
.demo_line_02 span{
    position: relative;
    top: -8px;
    background: #fff;
    padding: 0 20px;
}

优点:代码简洁,可自适应宽度

inline-block实现分隔线:

 

点此查看实例展示

 

.demo_line_03{
    width:600px;
}
.demo_line_03 b{
    background: #ddd;
    margin-top: 4px;
    display: inline-block;
    width: 180px;
    height: 1px;
    _overflow: hidden;
    vertical-align: middle;
}
.demo_line_03 span{
    display: inline-block;
    width: 220px;
    vertical-align: middle;
}

优点:文字可多行

浮动实现分隔线:

 

点此查看实例展示

 

.demo_line_04{
    width:600px;
}
.demo_line_04{
    overflow: hidden;
    _zoom: 1;
}
.demo_line_04 b{
    background: #ddd;
    margin-top: 8px;
    float: left;
    width: 26%;
    height: 1px;
    _overflow: hidden;
}

优点:NUN

利用字符实现分隔线:

 

点此查看实例展示

 

<div class="demo_line_05">———————————<span>小小分隔线 字符来实现</span>————————————</div>
.demo_line_05{
    letter-spacing: -1px;
    color: #ddd;
}
.demo_line_05 span{
    letter-spacing: 0;
    color: #222;
    margin:0 20px;
}

优点:代码简洁 以上简单介绍了分隔线的写法,也许还有其它比较合适的写法,看环境各取所需吧!