案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<h1>My First Web Page</h1>
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​
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<p id="demo">A Paragraph.</p>
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​
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<button type="button" onclick="myFunction()">点击这里</button>
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​
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<script>
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function myFunction()
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{
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document.getElementById("demo").innerHTML="My First JavaScript Function";
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}
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</script>
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​
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</body>
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</html>
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