如果输入 a 或 b 正确/正确，如何执行操作?

Question

>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。
但是，如果用户用大写字母写"足球"怎么办？ 我试图实现"逻辑或"||但我无法让它工作。

var input = document.getElementById("user_input");
let footballTeams = ["Manchester","Barcelona","Copenhagen"]
if (input.value == "football") {
alert("These cities have football teams:" +
"n" + footballTeams[0] + "," + " " + footballTeams[1] + "," + " " + footballTeams[2])

Answer 1

试试这个：

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

Answer 2

尝试

if (input.value.toLowerCase() == "football") {
console.log('inside if');
}

<input id=input value="Football">