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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/api/console/count/index.html | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/api/console/count/index.html b/files/zh-cn/web/api/console/count/index.html new file mode 100644 index 0000000000..9b28cc12df --- /dev/null +++ b/files/zh-cn/web/api/console/count/index.html @@ -0,0 +1,169 @@ +--- +title: Console.count() +slug: Web/API/Console/count +translation_of: Web/API/Console/count +--- +<div>{{APIRef("Console API")}}{{Non-standard_header}}</div> + +<p>输出 count() 被调用的次数。此函数接受一个可选参数 <code>label。</code></p> + +<p>{{AvailableInWorkers}}</p> + +<p>如果有 <code>label</code>,此函数输出为那个指定的 <code>label 和</code> count() 被调用的次数。</p> + +<p>如果 <code>label </code>被忽略,此函数输出 count() 在其所处位置上被调用的次数。</p> + +<p>例如,下面的代码:</p> + +<pre class="brush: js">var user = ""; + +function greet() { + console.count(); + return "hi " + user; +} + +user = "bob"; +greet(); +user = "alice"; +greet(); +greet(); +console.count();</pre> + +<p>Console 的输出如下:</p> + +<pre class="eval">"<no label>: 1" +"<no label>: 2" +"<no label>: 3" +"<no label>: 1" +</pre> + +<p>注意最后一行的日志输出:在 11 行对 count() 的单独调用是被当作一个独立事件来处理的。</p> + +<p>如果把变量 <code>user </code>当作<code> label 参数传给前面调用的 count(),把字符串 "alice" 传给后面调用的 count():</code></p> + +<pre class="brush: js">var user = ""; + +function greet() { + console.count(user); + return "hi " + user; +} + +user = "bob"; +greet(); +user = "alice"; +greet(); +greet(); +console.count("alice");</pre> + +<p>可以看到输出如下:</p> + +<pre class="eval">"bob: 1" +"alice: 1" +"alice: 2" +"alice: 3"</pre> + +<p>现在可以基于不同的 <code>label</code> 值维护不同的数值。由于 11 行的 <code>label 匹配了两次 user 的值,因此它不会被当作独立的事件。</code></p> + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox">console.count([label]); +</pre> + +<h2 id="参数">参数</h2> + +<dl> + <dt><code>label</code></dt> +</dl> + +<p> 字符串,如果有,count() 输出此给定的 <code>label 及其</code>被调用的次数。</p> + +<p><strong style="color: #4d4e53; font-size: 2.143rem; font-weight: 700; letter-spacing: -1px;">规范</strong></p> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName("Console API", "#consolecountlabel", "console.count()")}}</td> + <td>{{Spec2("Console API")}}</td> + <td>Initial definition</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容性">浏览器兼容性</h2> + +<p>{{CompatibilityTable}}</p> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Edge</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatGeckoDesktop("30.0")}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + <tr> + <td>Available in workers</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatGeckoDesktop("38.0")}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Edge</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>{{CompatVersionUnknown}}</td> + <td>{{CompatGeckoMobile("30.0")}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + <tr> + <td>Available in workers</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatGeckoMobile("38.0")}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> |