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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <iframe id="myframe" src="demo_iframe.htm"> <p>您的浏览器不支持 iframe。</p> </iframe> <p>单击该按钮可更改 iframe 中文档的背景颜色。</p> <p id="demo"></p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myframe"); x.style.backgroundColor = "red"; } </script> </body> </html>