If the string does not contain the substring then it will return null. We will take an example to understand it. var actualstring = "Javascript match method", var substringToCheck = "match"; actualstring.match("match"); //["match", index: 11, input: "Javascript match method", ...
If you want to find if a string contains another string then you already have a ready made function for that, and it would bestring.includes(). This function returnstruewhen the method finds another substring included in the main one, and returnsfalsewhen the main string does not contain th...
alert(str2.includes('fox', 4)); // output: true // 示例3：结合模板字符串使用 let str3 = 'JavaScript';if (str3.includes('Script')) { alert(`The string "${str3}" contains "Script".`);} else { alert(`The string "${str3}" does not contain "Script".`);} 五、注意事项 1、...
Therefore, if the return value is not -1, we can safely assume that the string does contain the substring we are looking for. Note that you can also use this method to search for a single character. Why not use the includes() method? You can also use theString.prototype.includes()meth...
@param {string|string[]=} locales A locale string or array of locale strings that contain one ...
... System.out.println("The string does not contain " + subStr); } } } } 代码中的字符串数组包含了我们想要检查的所有字符序列...,使用一个for-each循环对每个字符序列进行检查,如果原字符串包含当前字符序列,就打印出相应的信息。 1.5K20
随着let和const这两个关键字的添加,JS增加了块级作用域的概念。 如何在JavaScript中使用let 当我们在用let声明变量时,用于声明一次之后就不能再以相同的名称重新声明它。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // ES5 Codevarvalue=10;console.log(value);// 10varvalue="hello";console.log(valu...
A BCP 47 language tag defines a language that may contain a primary language code as well as an extension. If this parameter is not provided, the toLocaleUpperCase() method will use the host environment's current locale.Returns The toLocaleUpperCase() method returns a string converted to upper...
If the separator is omitted, the returned array will contain the whole string in index [0]. If the separator is "", the returned array will be an array of single characters: Example text.split("") Try it Yourself » Complete String Reference ...
log(`String does not contain "${substr}"`) } // String contains "React" The String.includes() method takes two parameters: searchString— The substring to search for within this string. position— The index to start the search from. This parameter is optional. If not specified, the ...