万万没想到，写了快三年前端，有不会用的css，居然还有完全没听过、见过的css属性，而且还是CSS2的内容！
关于counter-reset、content-increment两个属性的详解可以参看张鑫旭的博文：《CSS计数器(序列数字字符自动递增)详解》，这里做个记录，写个demo
<!DOCTYPE html><html><head><meta charset="utf-8" /><title>content-increment</title><style>.test li {margin:16px 0;padding:0;list-style:none;}.test li li:before{color:#f00;font-family:'Microsoft YaHei';}.counter1 li{counter-increment:testname;}.counter1 li:before{content:counter(testname)".";}.counter2 li{counter-increment:testname2 2;}.counter2 li:before{content:counter(testname2)"/";}.counter3 li{counter-increment:testname3 -1;}.counter3 li:before{content:counter(testname3)")";}.counter4 li{counter-increment:testname4;}.counter4 li:before{content:counter(testname4, upper-roman)". ";}.counter5 {counter-reset:testname5;}.counter5 li:before{content: counters(testname5, '-') '. '; counter-increment: testname5;color:blue;font-family: 'Microsoft YaHei';}</style></head><body><ul class="test"> <li class="counter1"> <strong>默认时的计数器：</strong> <ul> <li>列表项</li> <li>列表项</li> <li>列表项</li> </ul> </li> <li class="counter2"> <strong>修改计数器每次增加的值为2：</strong> <ul> <li>列表项</li> <li>列表项</li> <li>列表项</li> </ul> </li> <li class="counter3"> <strong>修改计数器每次增加的值为-1：</strong> <ul> <li>列表项</li> <li>列表项</li> <li>列表项</li> </ul> </li> <li class="counter4"> <strong>修改计数器以罗马字符显示：</strong> <ul> <li>列表项</li> <li>列表项</li> <li>列表项</li> </ul> </li></ul><ul class="test counter5"> <strong>计数器以嵌套计数显示:</strong> <li>父级</li> <li>父级 <ul class="counter5"> <li>子级1</li> <li>子级2</li> <li>子级3</li> </ul> </li> <li>父级 <ul class="counter5"> <li>子级1</li> <li>子级2</li> <li>子级3</li> </ul> </li> <li>父级</li></ul></body></html>兼容情况还不错：
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