元素的class和id问题
一个元素有且只能有1个id，且全文中此id只能出如今一个元素上
一个元素不能写屡次class，好比
<div class="a" class="b"></div>
这样写的话，第2个class会不生效（出现这个问题是由于我写标签时，其中的属性过多，忘记了前面已经定义了一个class，就又写了一个，因此后面的class就没生效）
结果以下图
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