javascript的点击复制事件

function copy()
{var text&＃61;document.getElementById("txtUser").value;if(copy2Clipboard(text)!&＃61;false){ alert("复制成功了&＃xff01; "); }
}
function copy2Clipboard(txt)
{ if(window.clipboardData){ window.clipboardData.clearData(); window.clipboardData.setData("Text",txt); }else if(navigator.userAgent.indexOf("Opera")!&＃61;-1){ window.location&＃61;txt; }else if(window.netscape){ try{ netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); } catch(e){ alert("您使用的浏览器不支持此复制功能&＃xff0c;请使用Ctrl&＃43;C或鼠标右键。"); return false; } var clip&＃61;Components.classes[&＃39;&＃64;mozilla.org/widget/clipboard;1&＃39;].createInstance(Components.interfaces.nsIClipboard); if(!clip)return; var trans&＃61;Components.classes[&＃39;&＃64;mozilla.org/widget/transferable;1&＃39;].createInstance(Components.interfaces.nsITransferable); if(!trans)return; trans.addDataFlavor(&＃39;text/unicode&＃39;); var str&＃61;new Object(); var len&＃61;new Object(); var str&＃61;Components.classes["&＃64;mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString); var copytext&＃61;txt;str.data&＃61;copytext; trans.setTransferData("text/unicode",str,copytext.length*2); var clipid&＃61;Components.interfaces.nsIClipboard; if(!clip)return false; clip.setData(trans,null,clipid.kGlobalClipboard); return true;}
}