console 命令行工具 X clear

console

<div class="div_1">
    <a href="#" class="a_1">你好啊</a>
</div>

.div_1{
    background:#ccc;
    color:#fff;
    height:100px;
    line-height:100px;
}
.a_1{
    color:#fff;
}
hover .a_1{
    color:#fff;
}