1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Document</title> 6 <style type="text/css"> 7 table{ 8 width:200px; 9 height:200px; 10 border:1px solid red; 11 border-collapse:collapse; 12 } 13 td{ 14 border:1px solid red; 15 16 } 17 </style> 18 </head> 19 <body> 20 <table cellspacing="0"> 21 <tr> 22 <td></td> 23 <td></td> 24 <td></td> 25 </tr> 26 <tr> 27 <td></td> 28 <td></td> 29 <td></td> 30 </tr> 31 <tr> 32 <td></td> 33 <td></td> 34 <td></td> 35 </tr> 36 </table> 37 </body> 38 </html>
边框合并：border-collapse:collapse;