main.php#主框架布局代码，用
page.html
<html>
<body>
<h1>This is Page</h1>
<br>
<a href="page1.html" target="showframe">page1</a>
<br>
<a href="page2.html" target="showframe">page2</a>
</body>
</html>
page1.html
<html>
<body>
<h1>This is Page1</h1>
</body>
</html>
page2.html
<html>
<body>
<h1>This is Page2</h1>
</body>
</html>
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