This JavaScript tutorial explains how to use the string method called includes() with syntax and examples. In JavaScript, includes() is a string method that determines whether a substring is found in a string.
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. ...
However, you can easily polyfill this method: if (!String.prototype.includes) { String.prototype.includes = function(search, start) { 'use strict'; if (search instanceof RegExp) { throw TypeError('first argument must not be a RegExp'); } if (start === undefined) { start = 0; } ...
Check if a string contains another string in just one line of code in JavaScript with the includes method.
JavaScript String includes() Theincludes()method returns true if a string contains a specified value. Otherwise it returnsfalse. Examples Check if a string includes "world": lettext ="Hello world, welcome to the universe."; text.includes("world"); ...
js随笔(二):JS String Method String Methods and Properties String.length: length() 返回字符串长度 1 2 var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; var sln = txt.length; Finding a String in a String: indexOf(str,[, index]) 在字符串中找到你想要的字符串,indexOf返回的位置是你搜索字符串第一次...
JSHost Properties Methods ImportAsync JSImportAttribute JSMarshalAsAttribute<T> JSObject JSType JSType.Any JSType.Array<T> JSType.BigInt JSType.Boolean JSType.Date JSType.Discard JSType.Error JSType.Function JSType.Function<T> JSType.Function<T1,T2> JSType.Function<T1,T2,T3> JSType.Func...
Returnstrueif this JSValue has the specifiedproperty. C# [Foundation.Export("hasProperty:")]publicvirtualboolHasProperty(stringproperty); Parameters property String Returns Boolean Attributes ExportAttribute Applies to ProductVersions Xamarin iOS SDK12 ...
ES6 新的String对象方法includes() 该方法检查字符串中是否包含是指定字符串。 语法 str.includes(searchString[, position]) 参数 searchString − 要检查的字符串 Position − 开始搜索searchString的位置;默认值为0。 返回值 如果包含指定的字符串,则返回true,否则返回false. 例子 var str = 'Hello World';...
String 值的 includes() 方法执行区分大小写的搜索,以确定是否可以在一个字符串中找到另一个字符串,并根据情况返回 true 或 false。