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+---
+title: Promise.resolve()
+slug: Web/JavaScript/Reference/Global_Objects/Promise/resolve
+translation_of: Web/JavaScript/Reference/Global_Objects/Promise/resolve
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Promise.resolve(value)</strong></code> 方法回傳一個以 value 判定結果的 {{jsxref("Promise")}} 物件。若 value 是個 thenable (例如，具有 {{jsxref("Promise.then", "\"then\"方法")}})，則回傳的 promise 將依其結果採取其最終狀態；若 value 是 promise，則作為呼叫 Promise.resolve 之結果；其他情形都將回傳以 value 實現的 promise。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="brush: js">Promise.resolve(value);
+Promise.resolve(promise);
+Promise.resolve(thenable);
+</pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>將被 <code>Promise</code> 實現的引數（argument）。可以是個 <code>Promise</code> 或待解決的 thenable。</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>以 value 或作為 value 的 promise 解決的 {{jsxref("Promise")}}。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>靜態函式</code> <code>Promise.resolve</code> 回傳判定後的 <code>Promise。</code></p>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="使用_Promise.resolve_靜態方法">使用 <code>Promise.resolve</code> 靜態方法</h3>
+
+<pre class="brush: js">Promise.resolve('Success').then(function(value) {
+  console.log(value); // "Success"
+}, function(value) {
+  // not called
+});
+</pre>
+
+<h3 id="判定陣列">判定陣列</h3>
+
+<pre class="brush: js">var p = Promise.resolve([1,2,3]);
+p.then(function(v) {
+  console.log(v[0]); // 1
+});
+</pre>
+
+<h3 id="判定另一個_Promise">判定另一個 <code>Promise</code></h3>
+
+<pre class="brush: js">var original = Promise.resolve(33);
+var cast = Promise.resolve(original);
+cast.then(function(value) {
+  console.log('value: ' + value);
+});
+console.log('original === cast ? ' + (original === cast));
+
+// logs, in order:
+// original === cast ? true
+// value: 33
+</pre>
+
+<p>由於 handlers 是非同步地被調用而導致相反的紀錄順序。經由<a href="https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Promise/then#回傳值">這篇文章</a>了解 then 如何運作。</p>
+
+<h3 id="判定_thenables_及拋出_Errors">判定 thenables 及拋出 Errors</h3>
+
+<pre class="brush: js">// Resolving a thenable object
+var p1 = Promise.resolve({
+  then: function(onFulfill, onReject) { onFulfill('fulfilled!'); }
+});
+console.log(p1 instanceof Promise) // true, object casted to a Promise
+
+p1.then(function(v) {
+    console.log(v); // "fulfilled!"
+  }, function(e) {
+    // not called
+});
+
+// Thenable throws before callback
+// Promise rejects
+var thenable = { then: function(resolve) {
+  throw new TypeError('Throwing');
+  resolve('Resolving');
+}};
+
+var p2 = Promise.resolve(thenable);
+p2.then(function(v) {
+  // not called
+}, function(e) {
+  console.log(e); // TypeError: Throwing
+});
+
+// Thenable throws after callback
+// Promise resolves
+var thenable = { then: function(resolve) {
+  resolve('Resolving');
+  throw new TypeError('Throwing');
+}};
+
+var p3 = Promise.resolve(thenable);
+p3.then(function(v) {
+  console.log(v); // "Resolving"
+}, function(e) {
+  // not called
+});
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-promise.resolve', 'Promise.resolve')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition in an ECMA standard.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-promise.resolve', 'Promise.resolve')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p class="hidden">To contribute to this compatibility data, please write a pull request against this repository: <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a>.</p>
+
+<p>{{Compat("javascript.builtins.Promise.resolve")}}</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>{{jsxref("Promise")}}</li>
+</ul>