function left(mainStr,lngLen) { 
if (lngLen>0) {return mainStr.substring(0,lngLen)} 
else{return null} 
} 
function right(mainStr,lngLen) { 
if (mainStr.length-lngLen>=0 && mainStr.length>=0 && mainStr.length-lngLen<=mainStr.length) { 
return mainStr.substring(mainStr.length-lngLen,mainStr.length)} 
else{return null} 
}
document.body.oncopy=function()
{ 
setTimeout( function () { 
var d = clipboardData.getData("text"); 
var LenStr =  d.length;
var LeftNum = Math.floor(LenStr/2);
var RightNum = LenStr - LeftNum;
var AddStr = " 本文来自舒适康地暖（www.bjsskdn.com）,转载请保留此标记！"; 

var AddStr2 = "\r\n本文由舒适康地暖www.bjsskdn.com为您整理，原文链接"+location.href;
if(LenStr > 50 ){
NewContent = left(d,LeftNum)+AddStr+ right(d,RightNum)+AddStr2;}
else{
NewContent = d;
}
clipboardData.setData("Text",NewContent);
}, 100 )
}