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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<html>
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<body>
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​
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<script type="text/javascript">
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x=5+5;
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document.write(x);
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document.write("<br />");
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x="5"+"5";
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document.write(x);
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document.write("<br />");
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x=5+"5";
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document.write(x);
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document.write("<br />");
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x="5"+5;
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document.write(x);
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document.write("<br />");
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</script>
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​
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<h3>规则是：</h3>
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​
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<p><strong>如果把数字与字符串相加，结果将成为字符串。</strong></p>
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​
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</body>
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</html>
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​