<!DOCTYPE html><html><head><script>function changeSrc(){document.getElementById("myframe").src="http://google.com";}</script></head><body><iframe id="myframe" src="/default.asp"><p>Your browser does not support iframes.</p></iframe><br><br><input type="button" onclick="changeSrc()" value="Change Source"></body></html>希望本文所述对大家的javascript程序设计有所帮助。