请问梅兄.折叠的＋,－这图片这样出现呢?

lz要问啥？！图片当然事先做好滴，
用js控制显隐或者更改图片地址均可实现切换效果！

解决方案 »

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页面上内容:<table>
<TR ID='JSYD' ParentID='114E' Depth='1' Class='Node-Hidden'><TD title='test' style='padding-left:1em' noWrap='true'><IMG SRC='plus.gif' style="cursor:hand;" onClick=clickNode('JSYD')></IMG> <A href=# onclick=clickNode('JSYD')>test</A></TD></TR>
<TR ID='111' ParentID='JSYD' Depth='2' Class='Node-Hidden'><TD title='test1' style='cursor:hand;padding-left:2em' noWrap='true'>&nbsp&nbsp&nbsp<A href=#' target='_blank'>test1</A></TD></TR>
<TR ID='112' ParentID='JSYD' Depth='2' Class='Node-Hidden'><TD title='test2' style='cursor:hand;padding-left:2em' noWrap='true'>&nbsp&nbsp&nbsp<A href=#' target='_blank'>test2</A></TD></TR>
</table>js函数:  {
    thisRow = document.all.item(id);

    if(thisRow)
      {
        //已经展开
       if(thisRow.getAttribute("Expanded") == "yes"){

            thisRow.setAttribute("Expanded","no");
            thisRow.children(0).children(0).src = "plus.gif";
            var allRows = document.all.tags("TR");
            for(var i=0;i<allRows.length;i++){
                var row = allRows[i];
                if(row.getAttribute("ParentID") == id && row.getAttribute("ID") != id){
                   row.className = "Node-Hidden";
                   if(row.getAttribute("Expanded") == "yes")
                      clickNode(row.getAttribute("ID"));

                }

            }
        }
       //没有展开
        else{

            thisRow.setAttribute("Expanded","yes");
            thisRow.children(0).children(0).src = "minus.gif";
            var allRows = document.all.tags("TR");
            for(var i=0;i<allRows.length;i++){
                 var row = allRows[i];
                 if(row.getAttribute("ParentID") == id)
                     row.className = "Node";

            }

        }
      }

  }
图片:minus.gif
plus.gif
图片切换很简单L@_@K
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> new document </title>
    <meta name="generator" content="editplus" />
    <meta name="author" content="Gao YiXiang" />
    <meta name="email" content="[email protected]" />
    <meta name="keywords" content="javascript dhtml dom" />
    <meta name="description" content="I love web development." />
</head>
<body>
    <input type="button" id="btnChange" value="Show Baidu Logo" /><br />
    <img src="http://www.google.cn/intl/zh-CN/images/logo_cn.gif" alt="google" id="imgTest" />
    <script type="text/javascript">
    
    </script>
</body>
</html>
不用改图片地址吧,直接改css就行了,一般改变+-往往样式会有变化直接改class,在程序里还可以通过class的判断知道现在是+还是-
css里面可以通过背景属性显示+-
不用改图片地址吧,直接改css就行了,一般改变+-往往样式会有变化直接改class,在程序里还可以通过class的判断知道现在是+还是-
  css里面可以通过背景属性显示+---------------------------------------大哥麻烦给个例子看看.谢谢.:-)
<html>
<head>
<style>
.node{
text-decoration: none ;
}
.open{
cursor: hand ;
background-image : url(minus.gif) ;
background-repeat:no-repeat;
}
.closed{
cursor: hand ;
background-image : url(plus.gif) ;
background-repeat:no-repeat;
}
</style>
</head>
<body>
    <a class="node" href="javascript:void('')"><span class="open" onclick="this.className=this.className=='open'?'closed':'open'">  </span></a>
</body>
</html>高宽等自己调吧其实怎么实现都一样，能实现就可以了