- <!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">
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <script type="text/jscript">
- var x = -3;
- if(x < 0)
- {
- alert("负数");
- x= -x ;
- }
- alert(x);
- </script>
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你自己的问题吧
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