CSS中的計數器

大江小浪發表於2013-05-17
CSS

CSS的規範中，有一個很奇特的特性，支援計數器的功能。

 
先來看下如何使用：

<section>

     <p>Place the flour in a large bowl, make a well in the centre and pour in the milk and eggs. Give the liquid mixture a quick whisk before incorporating the flour. Continue to whisk until you have a smooth batter.</p>
     <p>Now add 1 tbsp vegetable oil and whisk thoroughly.</p>
     <p>Take a crêpe pan, or large frying pan, dip some kitchen roll in the oil and carefully wipe the inside of the pan. Heat the pan over a medium heat for one minute.</p>
     <p>Add just under a ladleful of batter to the pan and immediately start swirling it around the pan to produce a nice even layer.</p>
     <p>Cook the pancake for approximately 30-40 seconds. Use a palette knife to lift the pancake carefully to look at the underside to check it is golden-brown before turning over. Cook the other side for approx 30-40 seconds and transfer to a serving plate.</p>
</section>
 
這段程式碼表示了做一件事情的順序，現在我們可以使用CSS的計數器來給這些步驟標註順序。
 
下面的程式碼：

     body {

          counter-reset: steps;
     }
 
     p{
          color: #242424;
          font-size: 16px;
          line-height: 20px;
     }
     p:before {
          counter-increment: steps;
          content: “Step ” counter(steps) “: “;
          font-weight: bold;
          font-size: 18px;
     }
在瀏覽一下看看效果如何？每行之前都有了一個步驟的數字標註，很神奇吧。
 
這個屬性自CSS2.1起開始寫入規範，目前大多數主流的瀏覽器都可以支援，唯一不支援的就是IE7了。
 
這個特性看起來簡單，但是如果我們能夠合理的使用，效果還是非常好的。
 
參考資料：

 


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