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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
treed5d900deb656a5da18e0b60d00f0db73f3a2e88e /files/zh-cn/web/javascript/reference/global_objects/proxy/handler/get
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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----
-title: handler.get()
-slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/get
-tags:
- - ECMAScript6
- - JavaScript
- - Method
- - Proxy
-translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/get
----
-<div>{{JSRef}}</div>
-
-<p><strong><code>handler.get()</code></strong> 方法用于拦截对象的读取属性操作。</p>
-
-<h2 id="语法">语法</h2>
-
-<pre class="brush: js">var p = new Proxy(target, {
- get: function(target, property, receiver) {
- }
-});
-</pre>
-
-<h3 id="参数">参数</h3>
-
-<p>以下是传递给get方法的参数,<code>this上下文绑定在</code>handler对象上.</p>
-
-<dl>
- <dt><code>target</code></dt>
- <dd>目标对象。</dd>
- <dt><code>property</code></dt>
- <dd>被获取的属性名。</dd>
- <dt><code>receiver</code></dt>
- <dd>Proxy或者继承Proxy的对象</dd>
-</dl>
-
-<h3 id="返回值">返回值</h3>
-
-<p>get方法可以返回任何值。</p>
-
-<h2 id="描述">描述</h2>
-
-<p><strong><code>handler.get</code></strong> 方法用于拦截对象的读取属性操作。</p>
-
-<h3 id="拦截">拦截</h3>
-
-<p>该方法会拦截目标对象的以下操作:</p>
-
-<ul>
- <li>访问属性: <code>proxy[foo]和</code> <code>proxy.bar</code></li>
- <li>访问原型链上的属性: <code>Object.create(proxy)[foo]</code></li>
- <li>{{jsxref("Reflect.get()")}}</li>
-</ul>
-
-<h3 id="约束">约束</h3>
-
-<p>如果违背了以下的约束,proxy会抛出 {{jsxref("TypeError")}}:</p>
-
-<ul>
- <li>如果要访问的目标属性是不可写以及不可配置的,则返回的值必须与该目标属性的值相同。</li>
- <li>如果要访问的目标属性没有配置访问方法,即get方法是undefined的,则返回值必须为undefined。</li>
-</ul>
-
-<h2 id="示例">示例</h2>
-
-<p>以下代码演示如何拦截属性值的读取操作。</p>
-
-<pre class="brush: js">var p = new Proxy({}, {
- get: function(target, prop, receiver) {
- console.log("called: " + prop);
- return 10;
- }
-});
-
-console.log(p.a); // "called: a"
- // 10
-</pre>
-
-<p>以下代码演示违反约束的情况。</p>
-
-<pre class="brush: js">var obj = {};
-Object.defineProperty(obj, "a", {
- configurable: false,
- enumerable: false,
- value: 10,
- writable: false
-});
-
-var p = new Proxy(obj, {
- get: function(target, prop) {
- return 20;
- }
-});
-
-p.a; //会抛出TypeError
-</pre>
-
-<h2 id="规范">规范</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-proxy-object-internal-methods-and-internal-slots-get-p-receiver', '[[Get]]')}}</td>
- <td>{{Spec2('ES2015')}}</td>
- <td>Initial definition.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver', '[[Get]]')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<div>{{CompatibilityTable}}</div>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Chrome</th>
- <th>Firefox (Gecko)</th>
- <th>Internet Explorer</th>
- <th>Opera</th>
- <th>Safari</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoDesktop("18")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Android</th>
- <th>Chrome for Android</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>IE Mobile</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoMobile("18")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="另见">另见</h2>
-
-<ul>
- <li>{{jsxref("Proxy")}}</li>
- <li>{{jsxref("Proxy.handler", "handler")}}</li>
- <li>{{jsxref("Reflect.get()")}}</li>
-</ul>