css的一些小tips

自动添加小标

h1 {
    counter-reset: h2counter;
}
h2 {
    counter-increment: h2counter;
    counter-reset: h3counter;
}
h3 {
    counter-increment: h3counter;
    counter-reset: h4counter;
}
h4 {
    counter-increment: h4counter;
}

h2::before {
    content: counter(h2counter) ". ";
}
h3::before {
    content: counter(h2counter) "." counter(h3counter) ". ";
}
h4::before {
    content: counter(h2counter) "." counter(h3counter) "." counter(h4counter) ". ";
}

按钮添加超链接

标签中加属性：onclick="location.href='http://www.baidu.com'"