js复制到黏贴板代码 可以兼容多浏览器

<script type="text/javascript">

function copyCode(id){

var testCode=document.getElementById(id).value;

if(copy2Clipboard(testCode)!=false){

alert("生成的代码已经复制到粘贴板，你可以使用Ctrl+V 贴到需要的地方去了哦！ ");

}

}

copy2Clipboard=function(txt){

if(window.clipboardData){

window.clipboardData.clearData();

window.clipboardData.setData("Text",txt);

}

else if(navigator.userAgent.indexOf("Opera")!=-1){

window.location=txt;

}

else if(window.netscape){

try{

netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");

}

catch(e){

alert("您的firefox安全限制限制您进行剪贴板操作，请打开’about:config’将signed.applets.codebase_principal_support’设置为true’之后重试，相对路径为firefox根目录/greprefs/all.js");

return false;

}

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);

}

}

</script>

<div>

<a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode1');return false;">点击复制1</a>]<br>

<textarea rows=2 id="txtTestCode1" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容1</textarea>

</div>

<br><br>

<div>

<a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode2');return false;">点击复制2</a>]<br>

<textarea rows=2 id="txtTestCode2" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容2</textarea>

</div>

<br><br>

<div>

<a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode3');return false;">点击复制3</a>]<br>

<textarea rows=2 id="txtTestCode3" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容3</textarea>

</div>

<br><br>