带有多个逗号分隔值的变量声明是什么意思（例如var a = b，c，d;） [英] What does variable declaration with multiple comma separated values mean (e.g. var a = b,c,d;)

问题描述

当我尝试理解插件代码时，我经常会发现这些声明，但我不确切地知道这意味着什么。

When I try to understand plugin codes, I often find these kind of declarations but I don't know exactly what it means.

var a = b，c ，d;

var a = b,c,d;

推荐答案

这是一种句法简写，与以下内容相同：

This is a syntactic shorthand, and identical to:

var a = b;
var c;
var d;

第一个（a）初始化为b值，但c和d未初始化。

The first one (a) gets initialized with the value of b, but c and d are uninitialized.

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