javascript - 如果输入a或b是正确/正确，如何执行动作？ [重复](How can I execute an action if either input a or b is correct/true? [duplicate])

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(This question already has answers here) : ((这个问题已经在这里有了答案) ：)

How to do case insensitive string comparison? (不区分大小写的字符串比较怎么办？) (20 answers) (（20个答案）)

Closed 11 hours ago . (11小时前关闭。)

A user writes 'football' into my input bar and then the action on line 6 and 7 executes.(用户将“足球”写入我的输入栏中，然后执行第6行和第7行的操作。)

But I what if the user writes "Football", with a capital letter?(但是，如果用户用大写字母写“足球”怎??么办？) I tried to implement the "logial or" ||(我试图实现“逻辑或” ||) but I couldn't get it to work.(但我无法正常工作。) var input = document.getElementById("user_input"); let footballTeams = ["Manchester","Barcelona","Copenhagen"] if (input.value == "football") { alert("These cities have football teams:" + " " + footballTeams[0] + "," + " " + footballTeams[1] + "," + " " + footballTeams[2])   ask by Julius Nicolet Nielsson translate from so

Answer 1

尝试这个：

if (input.value.toLowerCase() == "football")