1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 2 <HTML> 3 <HEAD> 4 <TITLE> New Document </TITLE> 5 <META NAME="Generator" CONTENT="EditPlus"> 6 <META NAME="Author" CONTENT=""> 7 <META NAME="Keywords" CONTENT=""> 8 <META NAME="Description" CONTENT=""> 9 </HEAD> 10 11 <BODY> 12 <?php 13 echo "<p>第一种</p>"; 14 echo "<table width='600' border='1' cellspacing='0' cellspadding='0' >"; 15 for($j=1;$j<=9;$j++){ 16 echo "<tr>"; 17 for($i=1;$i<=$j;$i++){ 18 echo "<td>{$i}*{$j}=".($i*$j)."</td>"; 19 } 20 echo "</tr>"; 21 } 22 echo "</table>"; 23 24 echo "<p>第二种</p>"; 25 26 27 echo "<table width='600' border='1' cellspacing='0' cellspadding='0' >"; 28 for($j=9;$j>=1;$j--){ 29 echo "<tr>"; 30 for($i=1;$i<=$j;$i++){ 31 echo "<td>{$i}*{$j}=".($i*$j)."</td>"; 32 } 33 echo "</tr>"; 34 } 35 echo "</table>"; 36 37 38 echo "<p>第三种</p>"; 39 40 41 echo "<table width='600' border='1' cellspacing='0' cellspadding='0' >"; 42 for($j=9;$j>=1;$j--){ 43 echo "<tr>"; 44 for($z=0;$z<9-$j;$z++){ 45 echo "<td> </td>"; 46 } 47 for($i=1;$i<=$j;$i++){ 48 echo "<td>{$i}*{$j}=".($i*$j)."</td>"; 49 } 50 echo "</tr>"; 51 } 52 echo "</table>"; 53 54 55 56 echo "<p>第四种</p>"; 57 58 59 echo "<table width='600' border='1' cellspacing='0' cellspadding='0' >"; 60 for($j=1;$j<=9;$j++){ 61 echo "<tr>"; 62 63 for($p=0;$p<9-$j;$p++){ 64 echo "<td> </td>"; 65 } 66 67 for($i=$j;$i>=1;$i--){ 68 echo "<td>{$i}*{$j}=".($i*$j)."</td>"; 69 } 70 echo "</tr>"; 71 } 72 echo "</table>"; 73 74 75 echo "<p></p>"; 76 ?> 77 </BODY> 78 </HTML>
界面分别是:
里面的规律是:看九九乘法表的走势，去定最外层的for循环,看列的变化:从1到9，还是9到1