为什么警报（[“a”、“b”、“c”、“d”、“e”][[1,2]，3,4]）以javascript输出e？
谁能告诉我为什么：为什么警报（[“a”、“b”、“c”、“d”、“e”][[1,2]，3,4]）以javascript输出e？,javascript,alert,Javascript,Alert,谁能告诉我为什么： alert(["a","b","c","d","e"][[1,2],3,4]) 在JavaScript中输出e？因为逗号是一个运算符，它执行所有分开的指令（：两条指令，每个指令也可以使用逗号运算符），并返回最后一条指令的结果。即： ["a","b","c","d","e"][[1,2],3,4] => ["a","b","c","d","e"][4] === "e"
alert(["a","b","c","d","e"][[1,2],3,4])
在JavaScript中输出e？因为逗号是一个运算符，它执行所有分开的指令（：两条指令，每个指令也可以使用逗号运算符），并返回最后一条指令的结果。即：
["a","b","c","d","e"][[1,2],3,4] => ["a","b","c","d","e"][4] === "e"