在需要调用原始字符串的方法或进行属性查找的上下文中,JavaScript 将自动包装原始字符串并在包装对象上调用方法或执行属性查找。 jsCopy to Clipboard const strPrim = "foo"; // 字面量是一个字符串原始值 const strPrim2 = String(1); // 被强制转换为字符串原始值“1” const strPrim3 = String(true);...
Need to know if a string ends with something? Simple, use #ES6 "endsWith" method. You don't even need to be a developer and you can guess what's going on. Making a language more human-readable is definitely the way to go 💪 ...
string.find javascript (1) string.xml 中的大点 (1) String.toLower() in JavaScript TheString.toLower()method is a built-in JavaScript function that converts the given string to lowercase and returns the resulting string. It does not modify the original string, but instead creates a new stri...
1. Using the toString() method 2. Using the join() method 3. Using the JSON.stringify() method 4. Using a loop Using the reduce() method Summary References Introduction In JavaScript, an array is a collection of values that can be of any data type, including other arrays. ...
上面的代码仅作为子字符串操作的示例。如果你需要替换子字符串,大多数情况下你会想要使用String.prototype.replace()函数。 Specification ECMAScript® 2025 Language Specification #sec-string.prototype.substring Report problems with this compatibility data on GitHub ...
Read MoreRegExp.prototype.test() – JavaScript | MDN Using indexOf() to check for whitespace in String We can also use the StringindexOf()method to check for whitespace in a given string. TheindexOfreturns the position of the first occurrence of a given value in a string. If the value...
If you ever need to check if a string begins with another string in JavaScript, use ES6's startsWith method...
For more information and examples, check out the officialMDN Web DocsandArray.prototype.includes()documentation. In conclusion, theincludes()method in JavaScript is a powerful and convenient tool for checking the presence of elements or substrings within strings and arrays. With the help of numerous...
The API is down for maintenance. You can continue to browse the MDN Web Docs, but MDN Plus and Search might not be available. Thank you for your patience! 面向开发者的 Web 技术 JavaScript JavaScript 参考 JavaScript 标准内置对象 String String.prototype.concat() 中文(简体) ...
Different methods to check if string contains spaces in JavaScript Method-1: Use indexOf method Not to be confused with the array indexOf method, the String.prototype.indexOf() takes a string argument and searches for it within the string it’s called upon and returns the index of the firs...