第一题:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css"> div{text-align: center; } hr{width:20px;display: inline-block} </style> </head> <body> <div> <h2>打印倒正金子搭直线</h2> <script type="text/javascript"> for(var i=7;i>2;i--){ for(var j=0;j<i-1;j++){ document.write("<hr/>"); } document.write("<br />"); } for(var n=1;n<=6;n++){ for(var h=0;h<n;h++){ document.write("<hr/>"); } document.write("<br />"); } </script> </div> </body> </html>
第二题:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>第二题</title> </head> <body> <script type="text/javascript"> var text=prompt("请输入正确的邮箱地址:","[email protected]" ); var opp1 = emale.indexOf("."), opp2 = emale.indexOf("@"); if(text==""){ alert("邮箱不能为空") } else if (opp1 == -1 || opp2 == -1) { alert ("格式错误!"); } else { alert("格式正确,你的邮箱名称是"+text) } </script> </body> </html>
第三题:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>第三题</title> </head> <body> <script type="text/javascript"> var weekday=prompt("请输入今天星期几:",""); switch (weekday){ case "星期一": alert("新的一周开始了"); break; case "星期二": case "星期三": case "星期四": alert("努力工作"); break; case "星期五": alert("明天就是周末了"); break; default: alert("放松的休息"); break; } </script> </body> </html>