files/zh-cn/web/api/document/onbeforescriptexecute/index.html


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---
title: element.onbeforescriptexecute
slug: Web/API/Document/onbeforescriptexecute
tags:
  - DOM
  - onbeforescriptexecute
translation_of: 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>