W3CAPI 实例工具箱
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript Number object - NAN property example</title> </head> <body> <h1 style="color: red">JavaScript Number object : NAN property</h1> <hr /> <script type="text/javascript"> //This is done to make the following JavaScript code compatible to XHTML. <![CDATA[ if(123 == Number.NaN) { document.write("This is not a number.... " + "<br>"); } else { document.write("It is a number...." + "<br>"); } var week = 17; if ( week < 1 || week > 7) { week = Number.NaN; document.write(week); } //]]> </script> </body> </html>
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