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| author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
|---|---|---|
| committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
| commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
| tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply | |
| parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
| download | translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.tar.gz translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.tar.bz2 translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.zip | |
initial commit
Diffstat (limited to 'files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply')
| -rw-r--r-- | files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply/index.html | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply/index.html b/files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply/index.html new file mode 100644 index 0000000000..62b8b67f5f --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/proxy/handler/apply/index.html @@ -0,0 +1,117 @@ +--- +title: handler.apply() +slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply +tags: + - ECMAScript6 + - JavaScript + - Method + - Proxy +translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/apply +--- +<div>{{JSRef}}</div> + +<p><strong><code>handler.apply()</code></strong> 方法用于拦截函数的调用。</p> + +<div>{{EmbedInteractiveExample("pages/js/proxyhandler-apply.html", "taller")}}</div> + +<p class="hidden">此交互式示例的源代码存储在GitHub存储库中。 如果您想为交互式示例项目做出贡献,请克隆 <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> 并向我们发起拉取请求</p> + +<h2 id="语法">语法</h2> + +<pre class="brush: js">var p = new Proxy(target, { + apply: function(target, thisArg, argumentsList) { + } +}); +</pre> + +<h3 id="参数">参数</h3> + +<p>以下是传递给apply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(函数)。</dd> + <dt><code>thisArg</code></dt> + <dd>被调用时的上下文对象。</dd> + <dt><code>argumentsList</code></dt> + <dd>被调用时的参数数组。</dd> +</dl> + +<h3 id="返回值">返回值</h3> + +<p><code>apply方法可以返回任何值。</code></p> + +<h2 id="描述">描述</h2> + +<p><strong><code>handler.apply</code></strong> 方法用于拦截函数的调用。</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><code>proxy(...args)</code></li> + <li>{{jsxref("Function.prototype.apply()")}} 和 {{jsxref("Function.prototype.call()")}}</li> + <li>{{jsxref("Reflect.apply()")}}</li> +</ul> + +<h3 id="约束">约束</h3> + +<p>如果违反了以下约束,代理将抛出一个TypeError:</p> + +<p><code>target</code>必须是可被调用的。也就是说,它必须是一个函数对象。</p> + +<h2 id="示例">示例</h2> + +<p>以下代码演示如何捕获函数的调用。</p> + +<pre class="brush: js">var p = new Proxy(function() {}, { + apply: function(target, thisArg, argumentsList) { + console.log('called: ' + argumentsList.join(', ')); + return argumentsList[0] + argumentsList[1] + argumentsList[2]; + } +}); + +console.log(p(1, 2, 3)); // "called: 1, 2, 3" + // 6 +</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-call-thisargument-argumentslist', '[[Call]]')}}</td> + <td>{{Spec2('ES2015')}}</td> + <td>Initial definition.</td> + </tr> + <tr> + <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-call-thisargument-argumentslist', '[[Call]]')}}</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> +<div class="hidden">此页面上的兼容性表格由结构化数据生成。 如果您想为数据做出贡献,请检出 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并向我们发出拉取请求。</div> + +<p>{{Compat("javascript.builtins.Proxy.handler.apply")}}</p> +</div> + +<h2 id="另见">另见</h2> + +<ul> + <li>{{jsxref("Proxy")}}</li> + <li>{{jsxref("Proxy.handler", "handler")}}</li> + <li>{{jsxref("Function.prototype.apply")}}</li> + <li>{{jsxref("Function.prototype.call")}}</li> + <li>{{jsxref("Reflect.apply()")}}</li> +</ul> |
