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外部引入js文件的當前路徑是html文件的當前路徑

我的文件結構如下：
－－－current?? 這個文件夾放html文件
?????????????? ? |
???????????? ?? ?|----jscript?? 這個文件夾放javascript文件
???????????? ????|
??????????? ?? ? |----images??? 這個文件夾放圖片，有圖片icq01.gif、icq02.gif、google01.gif 等圖片

?? current/jscript/RandomBackgroundPicture.js 內容如下：

/**/ /* *
*??隨機顯示背景圖片
*/

function ?setRandomBackground()? {
???? var ?pic? = ? new ?Array( 8 )?;
????pic[ 0 ]? = ? " ../images/icq01.gif " ?;
????pic[ 1 ]? = ? " ../images/icq02.gif " ?;
????pic[ 2 ]? = ? " ../images/icq03.gif " ?;
????pic[ 3 ]? = ? " ../images/icq04.gif " ?;
????pic[ 4 ]? = ? " ../images/icq05.gif " ?;
????pic[ 5 ]? = ? " ../images/google01.gif " ?;
????pic[ 6 ]? = ? " ../images/google02.gif " ?;
????pic[ 7 ]? = ? " ../images/google03.gif " ?;

???? var ?index? = ?Math.floor(?Math.random() * pic.length?)?;
????document.writeln( " <body?background=\ "" ?+?pic[index]?+? " \ " > " ?)?;?? // ?
}


function ?setBackground()? {
???? var ?pic? = ? new ?Array( 8 )?;
????pic[ 0 ]? = ? " images/icq01.gif " ?;
????pic[ 1 ]? = ? " images/icq02.gif " ?;
????pic[ 2 ]? = ? " images/icq03.gif " ?;
????pic[ 3 ]? = ? " images/icq04.gif " ?;
????pic[ 4 ]? = ? " images/icq05.gif " ?;
????pic[ 5 ]? = ? " images/google01.gif " ?;
????pic[ 6 ]? = ? " images/google02.gif " ?;
????pic[ 7 ]? = ? " images/google03.gif " ?;

???? var ?index? = ?Math.floor(?Math.random() * pic.length?)?;
????document.writeln( " <body?background=\ "" ?+?pic[index]?+? " \ " > " ?)?;??
} ? // setBackground

?? current/index.html文件如下：

< html >
< head >
< meta? name ="GENERATOR" ?content ="Microsoft?FrontPage?5.0" >
< meta? name ="ProgId" ?content ="FrontPage.Editor.Document" >
< meta? http-equiv ="Content-Type" ?content ="text/html;?charset=gb2312" >
< title > 新建網頁?1 </ title >


</ head >

< script? language ="javascript" ?src ="jscript/RandomBackgroundPicture.js" ></ script >

< script >
setBackground()?? // ?不能是?setRandomBackground()
</ script >


</ body >
</ html >

結論：html文件外部引入javascript時，javascript的當前路徑是html的當前路徑，而不是js文件的當前路徑。例如此例中，對于RandomBackgroundPicture.js本身而言，icq01.gif的相對路徑是"../images/icq01.gif"，但這是不正確的；當它被index.html引入時，相對路徑是相對與index.html的路徑而言，所以應該是"images/icq01.gif"才對。

?

posted on 2006-07-08 13:23 飛仙 閱讀(6790) 評論(0)  編輯  收藏 所屬分類: Javascript