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119 lines
5.9 KiB
HTML
119 lines
5.9 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<h2 id="Summary" name="Summary">概述</h2>
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<p><code><strong>Promise.reject(reason)</strong></code>方法返回一个带有拒绝原因reason参数的Promise对象。</p>
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<h2 id="Syntax" name="Syntax">语法</h2>
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<pre><code class="language-javascript"><var>Promise.reject(reason)</var>;</code></pre>
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<h3 id="Parameters">Parameters</h3>
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<dl>
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<dt>reason</dt>
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<dd>表示<code>Promise</code>被拒绝的原因。</dd>
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</dl>
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<h3 id="Return_value">Return value</h3>
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<dl>
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<dd>一个给定原因了的被拒绝的 <a href="Reference/Global_Objects/Promise" title="Promise 对象用于表示一个异步操作的最终状态（完成或失败），以及该异步操作的结果值。"><code>Promise</code></a>。</dd>
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</dl>
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<h2 id="Description" name="Description">描述</h2>
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<p><font face="Open Sans, sans-serif">静态函数</font><code>Promise.reject</code>返回一个被拒绝的<code>Promise对象</code>。通过使用<a href="Reference/Global_Objects/Error" title="通过Error的构造器可以创建一个错误对象。当运行时错误产生时，Error的实例对象会被抛出。Error对象也可用于用户自定义的异常的基础对象。下面列出了各种内建的标准错误类型。"><code>Error</code></a>的实例获取错误原因<code>reason</code>对调试和选择性错误捕捉很有帮助。</p>
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<h2 id="示例">示例</h2>
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<h3 id="使用静态Promise.reject()方法">使用静态<code>Promise.reject()</code>方法</h3>
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<pre><code class="language-javascript">Promise.reject("Testing static reject").then(function(reason) {
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// 未被调用
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}, function(reason) {
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console.log(reason); // "Testing static reject"
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});
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Promise.reject(new Error("fail")).then(function(result) {
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// 未被调用
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}, function(error) {
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console.log(error); // stacktrace
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});</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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<tr>
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<th scope="col">规范</th>
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<th scope="col">状态</th>
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<th scope="col">备注</th>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-promise.reject" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Promise.reject</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td>ECMA规范的首次定义</td>
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</tr>
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<tr>
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<td><a class="external" href="https://tc39.github.io/ecma262/#sec-promise.reject" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Promise.reject</small></a></td>
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<td><span class="spec-Draft">Draft</span></td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<h2 id="We're_converting_our_compatibility_data_into_a_machine-readable_JSON_format._This_compatibility_table_still_uses_the_old_format_because_we_haven't_yet_converted_the_data_it_contains._Find_out_how_you_can_help!_Desktop_Mobile"><span style="font-size: 14px; font-weight: normal; line-height: 1.5;"><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
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This compatibility table still uses the old format,
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because we haven't yet converted the data it contains.
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<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<div class="htab">
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<ul>
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<li class="selected"><a>Desktop</a></li>
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<li><a>Mobile</a></li>
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</ul>
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</div></span></h2>
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<div id="compat-desktop">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Chrome</th>
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<th>Firefox (Gecko)</th>
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<th>Internet Explorer</th>
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<th>Opera</th>
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<th>Safari</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td>32</td>
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<td><a href="/en-US/Firefox/Releases/24" title="Released on 2013-09-17.">24.0</a> (24.0) as <code>Future</code><br/>
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<a href="/en-US/Firefox/Releases/25" title="Released on 2013-10-29.">25.0</a> (25.0) as <code>Promise</code> behind a flag[1]<br/>
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<a href="/en-US/Firefox/Releases/29" title="Released on 2014-04-29.">29.0</a> (29.0) by default</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>19</td>
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<td>7.1</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div id="compat-mobile">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Android</th>
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<th>Firefox Mobile (Gecko)</th>
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<th>IE Mobile</th>
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<th>Opera Mobile</th>
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<th>Safari Mobile</th>
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<th>Chrome for Android</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>24.0 (24.0) as <code>Future</code><br/>
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25.0 (25.0) as <code>Promise</code> behind a flag[1]<br/>
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29.0 (29.0) by default</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>iOS 8</td>
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<td>32</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>[1] Gecko 24<span style="font-family: Consolas,Monaco,'Andale Mono',monospace;">实验性地实施了</span><code style="font-style: normal;">Promise类，它</code>最初被命名为<code style="font-style: normal;">Future，</code>在Gecko 25被重新命名为现在的名字， 但在<code style="font-style: normal;">dom.promise.enabled设置中被默认禁用。</code> <a class="external external-icon" href="https://bugzilla.mozilla.org/show_bug.cgi?id=918806" rel="noopener">Bug 918806</a> Gecko 29开始默认启用Promise。</p>
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<h2 id="参见">参见</h2>
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<ul>
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<li><a href="Reference/Global_Objects/Promise" title="Promise 对象用于表示一个异步操作的最终状态（完成或失败），以及该异步操作的结果值。"><code>Promise</code></a></li>
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<li><a class="external" href="https://github.com/petkaantonov/bluebird#error-handling" rel="noopener">使用BlueBird Promise库进行选择性错误捕捉</a></li>
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</ul>
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</article> |