echo 有关问题

echo <script>问题<br><img src="/img/2013/06/18/1551013391.jpg" alt="" /><br /><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush: php">&lt;br /&gt; case 'add' : //新增&lt;br /&gt; $sku=$_POST['sku_txt'];&lt;br /&gt; $salesku=$_POST['salesku_txt'];&lt;br /&gt; $fnsku=$_POST['fnsku_txt'];&lt;br /&gt; $diqu=$_POST['diqu_txt'];&lt;br /&gt; $asin=$_POST['asin'];&lt;br /&gt; $accout=$_POST['account'];&lt;br /&gt; $type=$_POST['type'];&lt;br /&gt; $query = mysql_query(&quot;insert into `sku_rule` (`item_code`,`sku`,`asin`,`fnsku`,`delivery_areas`,`account`,`type`)values('$sku','$salesku','$asin','$fnsku','$diqu','$accout','$type')&quot;);&lt;br /&gt; if (mysql_affected_rows($conn) != 1){&lt;br /&gt; echo &quot;&lt;script&gt; alert('添加失败!');location.href='sku_comparison.php';&lt;/script&gt;&quot;;&lt;br /&gt; } else {&lt;br /&gt; echo &quot;&lt;script&gt; alert('添加成功!');location.href='sku_comparison.php';&lt;/script&gt;&quot;;&lt;br /&gt; &lt;br /&gt; }&lt;br /&gt; break;&lt;br /&gt; &lt;br /&gt; case 'del' : //删除&lt;br /&gt; &lt;br /&gt;$id=$_GET[&quot;delivery&quot;];&lt;br /&gt;$SQL = &quot;delete from `sku_rule` where id in($id)&quot;;&lt;br /&gt; $result = mysql_query($SQL);&lt;br /&gt; if (mysql_affected_rows($conn) != 1){&lt;br /&gt; echo &quot;&lt;script&gt;alert('删除失败!');location.href='sku_comparison.php';&lt;/script&gt;&quot;;&lt;br /&gt; } else {&lt;br /&gt; echo &quot;&lt;script&gt;alert('删除成功!');location.href='sku_comparison.php';&lt;/script&gt;&quot;;&lt;br /&gt; }&lt;br /&gt; break;&lt;br /&gt;</pre>