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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: 'Warning: String.x is deprecated; use String.prototype.x instead'
+slug: Web/JavaScript/Reference/Errors/Deprecated_String_generics
+tags:
+ - JavaScript
+ - 警告
+translation_of: Web/JavaScript/Reference/Errors/Deprecated_String_generics
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="错误提示">错误提示</h2>
+
+<pre class="syntaxbox">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
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>警告。JavaScript 引擎不会停止运行。</p>
+
+<h2 id="哪里出错了?">哪里出错了?</h2>
+
+<p>非标准的泛型  {{jsxref("String")}} 方法已经被废弃,将来会被移除(这些方法仅在 Firefox 浏览器中得到实现)。String 泛型在 String 对象上提供了一系列的 String 实例方法,使得这些 String 方法可以应用于任何类型的对象。</p>
+
+<p>Firefox {{bug(1222552)}} 对 String 泛型方法的移除进行了追踪。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="废弃的语法">废弃的语法</h3>
+
+<pre class="brush: js example-bad">var num = 15;
+String.replace(num, /5/, '2');</pre>
+
+<h3 id="标准语法">标准语法</h3>
+
+<pre class="brush: js example-good">var num = 15;
+String(num).replace(/5/, '2');
+</pre>
+
+<h2 id="垫片">垫片</h2>
+
+<p>以下是一个垫片脚本来为不支持 String 泛型方法浏览器提供支持:</p>
+
+<pre class="brush: js">/*globals define*/
+// Assumes all supplied String instance methods already present
+// (one may use shims for these if not available)
+(function() {
+ 'use strict';
+
+ var i,
+ // We could also build the array of methods with the following, but the
+ // getOwnPropertyNames() method is non-shimable:
+ // Object.getOwnPropertyNames(String).filter(function(methodName) {
+ // return typeof String[methodName] === 'function';
+ // });
+ methods = [
+ 'contains', 'substring', 'toLowerCase', 'toUpperCase', 'charAt',
+ 'charCodeAt', 'indexOf', 'lastIndexOf', 'startsWith', 'endsWith',
+ 'trim', 'trimLeft', 'trimRight', 'toLocaleLowerCase', 'normalize',
+ 'toLocaleUpperCase', 'localeCompare', 'match', 'search', 'slice',
+ 'replace', 'split', 'substr', 'concat', 'localeCompare'
+ ],
+ methodCount = methods.length,
+ assignStringGeneric = function(methodName) {
+ var method = String.prototype[methodName];
+ String[methodName] = function(arg1) {
+ return method.apply(arg1, Array.prototype.slice.call(arguments, 1));
+ };
+ };
+
+ for (i = 0; i &lt; methodCount; i++) {
+ assignStringGeneric(methods[i]);
+ }
+}());</pre>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li>{{jsxref("String")}}</li>
+ <li>{{jsxref("Global_Objects/Array", "Generics", "#Array_generic_methods", 1)}} 同样存在于 {{jsxref("Array")}} 的方法中(也同样被废弃了)。</li>
+</ul>