To check if a Javascript String Contains a substring or not, we can use 7 different Javascript methods as listed in below table.
* / function contains(string, substr, isIgnoreCase) { if (isIgnoreCase) { string = string.toLowerCase(); substr = substr.toLowerCase(); } var startChar = substr.substring(0, 1); var strLen = substr.length; for (var j = 0; j<string.length - strLen + 1; j++) { if (string.c...
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、includes()方法区分大小写。2、如果搜索字符串为空，则返回true。3、如果指定的起始位置大...
How do you check if one string contains a substring in JavaScript?Craig Buckler
1if(largeString.indexOf(shortString) != -1)2{3//如果包含,进行相应处理;4} 也许一个字符串会包含另一字符串不止一次,这时第二个参数startIndex也许会派上用场,下面这个函数演示如何求得一个字符串包含另外一个字符串的次数: 1functioncountInstances(mainStr, subStr)2{3varcount = 0;4varoffset = 0;...
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. ...
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 ...
console.log(containsProfanity(message)); // true 3. 路径处理:在URL、文件路径或目录结构中,检查是否包含特定路径片段、文件扩展名等。 function isImageFile(path) { return path.endsWith(".jpg") || path.endsWith(".png") || path.includes(".jpeg"); ...
(1)、JavaScript中的5种原始数据类型:Undefined、Null、Boolean、Number和String。需要注意的是JavaScript中字符串属于原始数据类型。 (2)、typeof运算符用于查看变量类型,对变量或值调用typeof运算符将返回下列值之一: undefined – 如果变量是 Undefined 类型的 ...
includes()Returns if a string contains a specified value indexOf()Returns the index (position) of the first occurrence of a value in a string lastIndexOf()Returns the index (position) of the last occurrence of a value in a string