alert(str2.includes('fox', 20)); // output: false 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...
console.log(str.includes("")); // true 5.类型安全:虽然includes()会尝试将非字符串参数转换为字符串,但在编写代码时,最好确保传入的searchValue是预期的字符串类型,以避免潜在的类型转换问题和意外行为。 6.多位置匹配:includes()只需找到子字符串在一个字符串中的任意位置即可返回 true,它不会返回所有匹配...
letstr ='JavaScript String';console.log(str.includes('Script')); 输出: true 如前所述,includes() 匹配字符串区分大小写,因此,以下示例返回 false: letstr ='JavaScript String';console.log(str.includes('script')); 输出: f...
JavaScript includes() 方法 JavaScript String 对象 实例 查找字符串是否包含 'Runoob': [mycode3 type='js'] var str = 'Hello world, welcome to the Runoob。'; var n = str.includes('Runoob'); [/myc..
Check if a string includes "world": lettext ="Hello world, welcome to the universe."; letresult = text.includes("world"); Try it Yourself » More examples below. Description Theincludes()method returnstrueif a string contains a specified string. ...
一、string、String 区别 一般在使用的时候有以下这几种方法: const str1 = '2dadsvge'const str2= String('2dadsvge') const str3=newString('2dadsvge') 其返回的结果有一定的差异,使用 typeof,=== 对比下 console.log(typeofstr1,typeofstr2,typeofstr3)//string,string,objectconsole.log(str1...
includes()方法用于检查字符串是否包含指定的字符串或字符。 //includes()varmystring ="Hello, welcome to edureka";varn = mystring.includes("edureka");//output: True 17. endsWith() endsWith()函数检查字符串是否以指定的字符串或字符结束。
if(!String.prototype.includes){String.prototype.includes=function(search,start){'use strict';if(typeofstart!=='number'){start=0;}if(start+search.length>this.length){returnfalse;}else{returnthis.indexOf(search,start)!==-1;}};} 规范 ...
prototype.includes){Object.defineProperty(String.prototype,'includes',{value:function(search,start){if...
1. 不区分大小写查找:虽然 includes() 默认区分大小写,但可以通过将字符串和查找值转换为统一的大小写形式(通常为全小写或全大写)来实现不区分大小写的查找。 const str = "Hello, World!"; const searchValue = "world"; if (str.toLowerCase().includes(searchValue.toLowerCase())) { console.log(`$...