万能的js复制按钮

这是模仿优酷视频分享的js复制按钮，兼容各种浏览器

 <!--复制按钮js-->
<script>
function copyToClipboard(txt) {
    if (window.clipboardData) {
        window.clipboardData.clearData();
        window.clipboardData.setData("Text",document.getElementById(txt).value);
    } else if (navigator.userAgent.indexOf("Opera") != -1) {
        //do nothing      
    } else if (window.netscape) {
        try {
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        } catch (e) {
            alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将 'signed.applets.codebase_principal_support'设置为'true'");
        }
        var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
        if (!clip)   return;
        var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
        if (!trans) return;
        trans.addDataFlavor('text/unicode');
        var str = new Object();
        var len = new Object();
        var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
        var copytext = txt;
        str.data = copytext;
        trans.setTransferData("text/unicode", str, copytext.length * 2);
        var clipid = Components.interfaces.nsIClipboard;
        if (!clip)   return false;
        clip.setData(trans, null, clipid.kGlobalClipboard);
    }
    alert("你已经成功复制本地址，请直接粘贴推荐给你的朋友!");
}
</script>

*********************************************************************************************

使用：

<!--分享对话框-->
           <div class="share" >
  <div class="sharetop"></div>
  <div class="sharebord">
  <h4>  分享给站外好友</h4>
<div class="item"><span class="label">  视频地址 : </span> <input type="text" id="link1" value="http://www.moredoo.com/10002" /><button onclick="javascript:copyToClipboard('link1');">复制</button></div>
<h4>  把视频贴到Blog或BBS</h4>


<div class="item"><span class="label">  flash地址: </span> 
<input type="text" id="link2" value="http://www.moredoo.com/10002" />
<button onclick="javascript:copyToClipboard('link2');">复制</button></div>


<div class="item"><span class="label">  html代码 : </span> 
<input  id="link3" type="text" value='<embed src="http://www.moredoo.com/10002" 


allowFullScreen="true" quality="high" width="480" height="400" align="middle" allowScriptAccess="always" type="application/x-shockwave-flash"></embed>' />


<button onclick="javascript:copyToClipboard('link3');">复制</button></div></div>


<div class="sharebutom">

效果如下

效果：