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                ## 關于偽類 LVHA 的解釋? ``` a標簽有四種狀態:鏈接訪問前、鏈接訪問后、鼠標滑過、激活,分別對應四種偽類:link、:visited、:hover、:active; 當鏈接未訪問過時: (1)當鼠標滑過a鏈接時,滿足:link和:hover兩種狀態,要改變a標簽的顏色,就必須將:hover偽類在:link偽 類后面聲明; (2)當鼠標點擊激活a鏈接時,同時滿足:link、:hover、:active三種狀態,要顯示a標簽激活時的樣式(:active), 必須將:active聲明放到:link和:hover之后。因此得出LVHA這個順序。 當鏈接訪問過時,情況基本同上,只不過需要將:link換成:visited。 這個順序能不能變?可以,但也只有:link和:visited可以交換位置,因為一個鏈接要么訪問過要么沒訪問過,不可能同時滿足, 也就不存在覆蓋的問題。 ```
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