字符串includes方法
时间: 2023-11-10 16:18:47 浏览: 47
在JavaScript中,includes()方法是一种字符串方法,用于确定一个字符串是否包含指定的子字符串。它可以通过String对象的特定实例调用。includes()方法有以下语法:string.includes(substring [, start_position]),其中substring是要查找的子字符串,start_position是可选参数,表示开始搜索的位置。includes()方法返回一个布尔值,如果找到了子字符串,则返回true,否则返回false。 includes()方法可以用于判断一个字符串是否包含指定的子字符串,或者对数组进行查询,判断是否包含某个元素。需要注意的是,includes()方法是区分大小写的。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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