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。
例如,你可以使用MDN提供的polyfill: javascript if (!Array.prototype.includes) { Object.defineProperty(Array.prototype, 'includes', { value: function(searchElement, fromIndex) { // 1. Let O be the result of calling ToObject passing // the this value as the argument. if (this == null) { ...
includes()方法用来判断当前数组是否包含某指定的值,如果是,则返回true,否则返回false。 语法 var boolean = array.includes(searchElement[,fromIndex]) 参数 searchElement 需要查找的元素值。 fromIndex 可选参数。从该索引处开始查找searchElement,默认为 0。
This version of MooTools checks whether String.prototype.contains() exists and, if it doesn't, MooTools adds its own function. With the introduction of this function in Firefox 17, the behavior of that check changed in a way that causes code based on MooTools' String.prototype.contains() ...
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...
For example, this hyperlink will open the Google homepage in a new window: Google Homepage Let’s add a hyperlink to our HTML document. We’ll link to the Mozilla Developer Network (MDN) list of all HTML elements. Add this code below our previous example: MDN List of HTML Elements...
当我们传入的类型在所给数组中存在在返回true，反之返回false，那么我们就在类型编程实现这么一个通用的...
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.includes() 中文(简体) ...
In latest versions of the library you added the .includes function in several parts of the code. And since this experimental feature is not supported by IE11, it breaks the app there. Then, if I try to add the Polyfill provided by MDN, it starts causing troubles in places where we loop...
GitHub -- github-utilities/make-readme MDN -- HTML Element -- picture MDN -- HTML Element -- img MDN -- Image file type and format guide MDN --MIME types (IANA media types) StackOverflow -- check if variable is type of string or array in liquid ...