Window length 属性用于返回当前窗口中 元素的数量。它是一个只读属性，它返回一个数字，表示当前窗口中的帧数。</p> <p><strong>句法：</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace">window.length</code></pre> </div> <p>下面的程序说明了窗口长度属性：</p> <p><strong>返回当前窗口中 <iframe> 元素的数量。</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title> Window length Property in HTML </title> <style> h1 { color: green; } h2 { font-family: Impact; } body { text-align: center; } </style> </head> <body> <h1>GeeksforGeeks</h1> <h2>Window length Property</h2> <iframe src= "https://www.geeksforgeeks.org"> For returning the number of iframe elements in the current window, double click the "Check Frames" button: Check Frames