如何用js判断字符串是否包含某个字符串

可以使用 JavaScript 中的 includes() 方法来判断字符串中是否包含另一个字符串。例如：

let str = "Hello, World!";
let target = "World";

if (str.includes(target)) {
  console.log(`"${target}" was found in "${str}"`);
} else {
  console.log(`"${target}" was not found in "${str}"`);
}

输出结果为：

"World" was found in "Hello, World!"