Warning: String.x is deprecated; use String.prototype.x instead

关于字符串泛型的 JavaScript 警告出现在 Firefox 68 之前的版本。从 Firefox 68 开始，字符串泛型已经被移除，这些警告信息已经过时了。

信息

Warning: String.charAt            is deprecated; use String.prototype.charAt            instead
Warning: String.charCodeAt        is deprecated; use String.prototype.charCodeAt        instead
Warning: String.concat            is deprecated; use String.prototype.concat            instead
Warning: String.contains          is deprecated; use String.prototype.contains          instead
Warning: String.endsWith          is deprecated; use String.prototype.endsWith          instead
Warning: String.includes          is deprecated; use String.prototype.includes          instead
Warning: String.indexOf           is deprecated; use String.prototype.indexOf           instead
Warning: String.lastIndexOf       is deprecated; use String.prototype.lastIndexOf       instead
Warning: String.localeCompare     is deprecated; use String.prototype.localeCompare     instead
Warning: String.match             is deprecated; use String.prototype.match             instead
Warning: String.normalize         is deprecated; use String.prototype.normalize         instead
Warning: String.replace           is deprecated; use String.prototype.replace           instead
Warning: String.search            is deprecated; use String.prototype.search            instead
Warning: String.slice             is deprecated; use String.prototype.slice             instead
Warning: String.split             is deprecated; use String.prototype.split             instead
Warning: String.startsWith        is deprecated; use String.prototype.startsWith        instead
Warning: String.substr            is deprecated; use String.prototype.substr            instead
Warning: String.substring         is deprecated; use String.prototype.substring         instead
Warning: String.toLocaleLowerCase is deprecated; use String.prototype.toLocaleLowerCase instead
Warning: String.toLocaleUpperCase is deprecated; use String.prototype.toLocaleUpperCase instead
Warning: String.toLowerCase       is deprecated; use String.prototype.toLowerCase       instead
Warning: String.toUpperCase       is deprecated; use String.prototype.toUpperCase       instead
Warning: String.trim              is deprecated; use String.prototype.trim              instead
Warning: String.trimLeft          is deprecated; use String.prototype.trimLeft          instead
Warning: String.trimRight         is deprecated; use String.prototype.trimRight         instead

错误类型

警告。JavaScript 的执行不会停止。

哪里出错了？

非标准的泛型 String 方法已经被废弃，已经在 Firefox 68 及更新版本中移除。String 泛型在 String 对象上提供了一系列的 String 实例方法，使得这些方法可以应用于任何类型的对象。

示例

废弃的语法

const num = 15;
String.replace(num, /5/, '2');

标准语法

const num = 15;
String(num).replace(/5/, '2');

参见

String