元素的class和id問題
一個元素有且只能有1個id，且全文中此id只能出如今一個元素上
一個元素不能寫屢次class，好比
<div class="a" class="b"></div>
這樣寫的話，第2個class會不生效（出現這個問題是由於我寫標籤時，其中的屬性過多，忘記了前面已經定義了一個class，就又寫了一個，因此後面的class就沒生效）
結果以下圖
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