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PHPz批改状态：合格
老师批语：
规则: 将任何一个"选择器"视为由:`id,class,tag`组成的 3 位整数当某个位置出现相应选择器类型时,将该位置置`1`即可id: 千位class: 百位 tag: 个位<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title></head><body><h3>Hello</h3><div class="hello">Hello world</div></body><style>h3 {color: blueviolet;}/* 0,0,1 */body h3 {color: black;}/* 0,0,2 *//* 0,0,1<0,0,2 */.hello {color: rgb(33, 223, 26);}/* 0,1,0 */div.hello {color: blue;}/* 0,1,10,1,0<0,1,1 */</style></html>
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Document</title></head><body><ul class="list"><li>item1</li><li>item2</li><li>item3</li><li>item4</li><li>item5</li><li>item6</li><li>item7</li><li>item8</li></ul></body><style>/* 公式: `:nth-of-type(an+b)` *//* 匹配一个: `a = 0` */.list > :nth-of-type(2) {background-color: rgb(223, 19, 212);}/* 匹配一组: `a = [1]`;'n=[0, 1, 2,...]'' */.list > :nth-of-type(n + 4) {background-color: rgb(131, 223, 235);}</style></html>
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