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                如果你恰巧是一個框架開發者或某個庫的維護者,你會發現自己正在使用的變量并不需要在所有情況下都進行更新:此時是多么類似一個常量。不幸的是(或者幸運的是?),Sass 不提供任何方式定義這樣的實體,所以我們要堅持嚴格的命名約定來闡述我們的想法。 對于眾多編程語言,我建議使用全大寫方式書寫常量。這不僅是一個由來已久的編程習慣,而且可以很好的與小寫連字符變量加以區別。 ~~~ // Yep $CSS_POSITIONS: (top, right, bottom, left, center); // Nope $css-positions: (top, right, bottom, left, center); ~~~ ## 擴展閱讀 * [Dealing With Constants in Sass](http://www.sitepoint.com/dealing-constants-sass/)
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