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81 lines
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HTML
81 lines
5.3 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<h2 id="错误提示">错误提示</h2>
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<pre><code class="language-javascript">Warning: String.charAt is deprecated; use String.prototype.charAt instead
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Warning: String.charCodeAt is deprecated; use String.prototype.charCodeAt instead
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Warning: String.concat is deprecated; use String.prototype.concat instead
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Warning: String.contains is deprecated; use String.prototype.contains instead
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Warning: String.endsWith is deprecated; use String.prototype.endsWith instead
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Warning: String.includes is deprecated; use String.prototype.includes instead
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Warning: String.indexOf is deprecated; use String.prototype.indexOf instead
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Warning: String.lastIndexOf is deprecated; use String.prototype.lastIndexOf instead
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Warning: String.localeCompare is deprecated; use String.prototype.localeCompare instead
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Warning: String.match is deprecated; use String.prototype.match instead
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Warning: String.normalize is deprecated; use String.prototype.normalize instead
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Warning: String.replace is deprecated; use String.prototype.replace instead
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Warning: String.search is deprecated; use String.prototype.search instead
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Warning: String.slice is deprecated; use String.prototype.slice instead
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Warning: String.split is deprecated; use String.prototype.split instead
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Warning: String.startsWith is deprecated; use String.prototype.startsWith instead
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Warning: String.substr is deprecated; use String.prototype.substr instead
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Warning: String.substring is deprecated; use String.prototype.substring instead
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Warning: String.toLocaleLowerCase is deprecated; use String.prototype.toLocaleLowerCase instead
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Warning: String.toLocaleUpperCase is deprecated; use String.prototype.toLocaleUpperCase instead
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Warning: String.toLowerCase is deprecated; use String.prototype.toLowerCase instead
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Warning: String.toUpperCase is deprecated; use String.prototype.toUpperCase instead
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Warning: String.trim is deprecated; use String.prototype.trim instead
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Warning: String.trimLeft is deprecated; use String.prototype.trimLeft instead
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Warning: String.trimRight is deprecated; use String.prototype.trimRight instead
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</code></pre>
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<h2 id="错误类型">错误类型</h2>
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<p>警告。JavaScript 引擎不会停止运行。</p>
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<h2 id="哪里出错了？">哪里出错了？</h2>
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<p>非标准的泛型 <a href="Reference/String" title="此页面仍未被本地化, 期待您的翻译!"><code>String</code></a> 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>
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<p>Firefox <a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1222552" rel="noopener" title="Remove String generics">bug 1222552</a> 对 String 泛型方法的移除进行了追踪。</p>
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<h2 id="示例">示例</h2>
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<h3 id="废弃的语法">废弃的语法</h3>
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<pre><code class="language-js example-bad">var num = 15;
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String.replace(num, /5/, '2');</code></pre>
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<h3 id="标准语法">标准语法</h3>
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<pre><code class="language-js example-good">var num = 15;
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String(num).replace(/5/, '2');
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</code></pre>
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<h2 id="垫片">垫片</h2>
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<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>
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<pre><code class="language-javascript">/*globals define*/
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// Assumes all supplied String instance methods already present
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// (one may use shims for these if not available)
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(function() {
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'use strict';
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var i,
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// We could also build the array of methods with the following, but the
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// getOwnPropertyNames() method is non-shimable:
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// Object.getOwnPropertyNames(String).filter(function(methodName) {
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// return typeof String[methodName] === 'function';
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// });
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methods = [
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'contains', 'substring', 'toLowerCase', 'toUpperCase', 'charAt',
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'charCodeAt', 'indexOf', 'lastIndexOf', 'startsWith', 'endsWith',
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'trim', 'trimLeft', 'trimRight', 'toLocaleLowerCase', 'normalize',
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'toLocaleUpperCase', 'localeCompare', 'match', 'search', 'slice',
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'replace', 'split', 'substr', 'concat', 'localeCompare'
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],
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methodCount = methods.length,
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assignStringGeneric = function(methodName) {
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var method = String.prototype[methodName];
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String[methodName] = function(arg1) {
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return method.apply(arg1, Array.prototype.slice.call(arguments, 1));
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};
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};
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for (i = 0; i < methodCount; i++) {
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assignStringGeneric(methods[i]);
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}
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}());</code></pre>
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<h2 id="相关内容">相关内容</h2>
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<ul>
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<li><a href="Reference/String" title="此页面仍未被本地化, 期待您的翻译!"><code>String</code></a></li>
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<li><a href="Reference/Global_Objects/Array#Array_generic_methods" title="JavaScript的 Array 对象是用于构造数组的全局对象，数组是类似于列表的高阶对象。">Generics</a> 同样存在于 <a href="Reference/Array" title="REDIRECT Array"><code>Array</code></a> 的方法中（也同样被废弃了）。</li>
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</ul>
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</article> |