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