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+---
+title: element.onbeforescriptexecute
+slug: Web/API/Document/beforescriptexecute_event
+tags:
+  - DOM
+  - onbeforescriptexecute
+translation_of: Web/API/Document/onbeforescriptexecute
+original_slug: Web/API/Document/onbeforescriptexecute
+---
+<div>{{ApiRef}}{{gecko_minversion_header("2")}}</div>
+
+<h2 id="概述">概述</h2>
+
+<p>当HTML文档中的<code><a class="new" href="../HTML/Element/script" title="&lt;script>">&lt;script&gt;</a></code>标签内的代码将要执行时触发该事件,如果这个<code>script</code>标签是用<code>appendChild()</code>等方法动态添加上去的,则不会触发该事件.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>document.onbeforescriptexecute = funcRef;</em>
+</pre>
+
+<p>当<code>beforescriptexecute</code>事件触发时,<code>funcRef</code>函数就会被调用. 传入参数<code>event</code>的<code>target</code>属性指向触发该事件的那个<code>script</code>元素.</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">function starting(e) {
+  logMessage("Starting script with ID: " + e.target.id);
+}
+
+document.addEventListener("beforescriptexecute", starting, true);
+</pre>
+
+<p><a href="/samples/html/currentScript.html">查看在线演示</a></p>
+
+<h2 id="规范">规范</h2>
+
+<ul>
+ <li><a href="http://www.whatwg.org/specs/web-apps/current-work/#the-script-element">HTML5</a></li>
+</ul>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("element.onafterscriptexecute")}}</li>
+ <li>{{domxref("document.currentScript")}}</li>
+</ul>