案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<!DOCTYPE html>
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<html>
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<body>
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​
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<p>点击下面的按钮，将代码块循环五次：</p>
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<button onclick="myFunction()">点击这里</button>
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<p id="demo"></p>
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​
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<script>
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function myFunction()
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{
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var x="";
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for (var i=0;i<5;i++)
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  {
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  x=x + "The number is " + i + "<br>";
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  }
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document.getElementById("demo").innerHTML=x;
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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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​