复制网页内容自动添加版权信息的方法(兼容IE、Firefox和Chrome)

//复制内容自动添加版权信息 
document.body.oncopy = function ()  
{ 
    setTimeout( 
        function () 
        { 
            var text = clipboardData.getData("text"); 
            if (text) 
            { 
                text = text + "\r\n原文出自【*****】，转载请保留原文链接："+location.href; 
                clipboardData.setData("text", text); 
            } 
        }, 
        100 
    ) 
} 

//复制内容自动添加版权信息 
 var Sys = {}; 
    var ua = navigator.userAgent.toLowerCase(); 
    if( window.ActiveXObject ) 
    { 
        document.body.oncopy=function() 
        { 
            event.returnValue = false; 
            var t=document.selection.createRange().text; 
            var s="\r\n原文出自[****] 转载请保留原文链接:"+location.href; 
            clipboardData.setData('Text',t+'\r\n'+s); 
        } 
    } 
    else 
    { 
        function addLink() 
        { 
            var body_element = document.getElementsByTagName('body')[0]; 
            var selection; 
            selection = window.getSelection(); 
            var pagelink = " 原文出自**** 转载请保留原文链接:"+document.location.href; 
 
            var copytext = selection + pagelink; 
            var newdiv = document.createElement('div'); 
            newdiv.style.position='absolute'; 
            newdiv.style.left='-99999px'; 
            body_element.appendChild(newdiv); 
            newdiv.innerHTML = copytext; 
            selection.selectAllChildren(newdiv); 
            window.setTimeout 
            ( 
                function() 
                { 
                    body_element.removeChild(newdiv); 
                },0 
            ); 
        } 
        document.oncopy = addLink; 
    }