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<!DOCTYPE html> <html> <body> <p>单击该按钮可更改第一个 iframe 元素（索引 0）的位置。</p> <button onclick="myFunction()">试一试</button> <br><br> <iframe src="https://www.begtut.com"></iframe> <iframe src="https://www.begtut.com"></iframe> <script> function myFunction() { window.frames[0].location = "https://www.begtut.com/jsref/"; } </script> </body> </html>