本文實(shí)例講述了PHP+JS三級菜單聯(lián)動菜單實(shí)現(xiàn)方法。分享給大家供大家參考，具體如下：

智能遞歸菜單-讀取數(shù)據(jù)庫

TD { FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; LINE-HEIGHT: 130%;

letter-spacing:1px } A:link { COLOR: #990000; FONT-FAMILY: "Verdana", "宋體";

FONT-SIZE: 12px; TEXT-DECORATION: none; letter-spacing:1px } A:visited

{ COLOR: #990000; FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; TEXT-DECORATION:

none; letter-spacing:1px } A:active { COLOR: #990000; FONT-FAMILY: "Verdana",

"宋體"; FONT-SIZE: 12px; TEXT-DECORATION: none; letter-spacing:1px } A:hover

{ COLOR: #ff0000; FONT-FAMILY: "Verdana", "宋體"; FONT-SIZE: 12px; TEXT-DECORATION:

underline; letter-spacing:1px } .Menu { COLOR:#000000; FONT-FAMILY: "Verdana",

"宋體"; FONT-SIZE: 12px; CURSOR: hand }

function ShowMenu(MenuID) {

if (MenuID.style.display == "none") {

MenuID.style.display = "";

} else {

MenuID.style.display = "none";

}

}

// $Id:$

//基本變量設(shè)置

$GLOBALS["ID"] = 1;

//用來跟蹤下拉菜單的ID號 $layer=1;

//用來跟蹤當(dāng)前菜單的級數(shù)

//連接數(shù)據(jù)庫

$Con=mysql_connect( "localhost", "root", "123456"); mysql_select_db(

"menu");

//提取一級菜單

$sql="select * from menu where parent_id=0" ;

$result=mysql_query($sql,$Con);

//如果一級菜單存在則開始菜單的顯示

if(mysql_num_rows($result)>0) ShowTreeMenu($Con, $result, $layer, $ID);

//=============================================

//顯示樹型菜單函數(shù) ShowTreeMenu($con,$result,$layer) //$con：數(shù)據(jù)庫連接

//$result：需要顯示的菜單記錄集

//layer：需要顯示的菜單的級數(shù)

//=============================================

function

ShowTreeMenu($Con, $result, $layer) {

//取得需要顯示的菜單的項(xiàng)目數(shù)

$numrows=mysql_num_rows($result);

//開始顯示菜單，每個子菜單都用一個表格來表示 echo "

< tablecellpadding = '0'cellspacing = '0'border = '0' > "; for($rows=0;$rows

//提取菜單項(xiàng)目的子菜單記錄集 $sql="select * frommenuwhereparent_id = $menu[id]" ; $result_sub=mysql_query($sql,$Con);

echo " < tr > "; //如果該菜單項(xiàng)目有子菜單，則添加JavaScript onClick語句 if(mysql_num_rows($result_sub)>

0) { echo " < tdwidth = '20' > < imgsrc = 'tree_expand.gif'border = '0' > < / td > "; echo " < tdclass = 'Menu'onClick = 'javascript:ShowMenu(Menu".$GLOBALS["ID"].");' > "; } else { echo " < tdwidth = '20' > < imgsrc = 'tree_collapse.gif'border = '0' > < / td > "; echo " < tdclass = 'Menu' > "; } //如果該菜單項(xiàng)目沒有子菜單，并指定了超級連接地址，則指定為超級連接， //否則只顯示菜單名稱 if($menu[url]!="")

echo " < ahref = '$menu[url]' > $menu[name] < / a > "; else echo $menu[name]; echo " < / td > < / tr > "; //如果該菜單項(xiàng)目有子菜單，則顯示子菜單 if(mysql_num_rows($result_sub)>0) { //指定該子菜單的ID和style，以便和onClick語句相對應(yīng)

echo " < trid = Menu".$GLOBALS["ID "]++ . " style='display:none'>";

echo "

";

echo "

";

//將級數(shù)加1

$layer++;

//遞歸調(diào)用ShowTreeMenu()函數(shù)，生成子菜單

ShowTreeMenu($Con,$result_sub,$layer);

//子菜單處理完成，返回到遞歸的上一層，將級數(shù)減1

$layer--;

echo "< / td > < / tr > ";

}

//繼續(xù)顯示下一個菜單項(xiàng)目

} echo " < / table > "; }

?>

$id=1 ;

function test() {

global $id; unset($id);

}

test();

echo " < fontclass = menu > ".($id). " < / font > ";

// 在 PHP 4 中這里會打印出 1

?>

$a=1 ;

$b=2 ;

function Sum() {

global $a, $b; $b=$ a + $b;

}

Sum();

echo " < fontclass = menu > ".$b. " < / font > ";

?>

希望本文所述對大家PHP程序設(shè)計有所幫助。

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