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 id="myH1"></h1>
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​
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<p id="myP"></p>
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​
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<script>
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//document.getElementById("myH1").innerHTML="Welcome to my Homepage";
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document.getElementById("myP").innerHTML="This is my first paragraph.";
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</script>
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​
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<p><b>注释：</b>注释不会被执行。</p>
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​
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</body>
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</html>
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​