具有多个表达式的JavaScript中的三元运算符？ [英] Ternary Operator in JavaScript With Multiple Expressions?
问题描述
the_styles ? the_styles.appendTo('head'); the_styles=null : the_styles = $('.stylesheet').detach();
显然，这是无效的。注意;在 appendTo（）和之间，the_styles = null 。如何在1行上写它并且仍然有多个这样的表达式？
Obviously, this isn't valid. Notice the ";" between the appendTo() and the_styles=null. How do I write it on 1 line and still have multiple expressions like that?
推荐答案
以这种方式使用逗号运算符：
Use the comma operator this way:
the_styles ? (the_styles.appendTo('head'), the_styles=null) : the_styles = $('.stylesheet').detach();
以下是Mozilla开发者中心撰写的关于逗号运算符的内容：
Here's what the Mozilla Developer Center writes about the comma operator:
如果要在需要单个表达式的位置包含多个表达式，可以使用逗号运算符。此运算符的最常见用法是在for循环中提供多个参数。
You can use the comma operator when you want to include multiple expressions in a location that requires a single expression. The most common usage of this operator is to supply multiple parameters in a for loop.
Read more here: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Operators/Special_Operators/Comma_Operator
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