带有多个表达式的 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;"appendTo() 和 the_styles=null 之间.我如何将它写在 1 行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

这样使用逗号:

the_styles ? (the_styles.appendTo('head'), the_styles=null) : the_styles =  $('.stylesheet').detach();

以下是 Mozilla 开发者中心对逗号运算符的描述:

Here's what the Mozilla Developer Center writes about the comma operator:

当您想在需要单个表达式的位置包含多个表达式时，可以使用逗号运算符.该运算符最常见的用法是在 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.

在此处阅读更多信息:https://developer.mozilla.org/zh/Core_JavaScript_1.5_Reference/Operators/Special_Operators/Comma_Operator

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