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JavaScript教程
JavaScript逻辑运算符与表达式
示例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>JavaScript逻辑运算符与表达式示例</title> </head> <body> <script type="text/javascript"> var a=true,b=false; document.write(!a); document.write("<br />"); document.write(!b); document.write("<br />"); a=true,b=true; document.write(a&&b); document.write("<br />"); document.write(a||b); document.write("<br />"); a=true,b=false; document.write(a&&b); document.write("<br />"); document.write(a||b); document.write("<br />"); a=false,b=false; document.write(a&&b); document.write("<br />"); document.write(a||b); document.write("<br />"); a=false,b=true; document.write(a&&b); document.write("<br />"); document.write(a||b); </script> </body> </html>