function getSelectedHtml(){

var selectedHtml = "";
var documentFragment = null;

try{
    if(window.getSelection){
        documentFragment =  window.getSelection().getRangeAt(0).cloneContents();
    }else if(document.selection){
        documentFragment =  document.selection.createRange().HtmlText;
    }

    for(var i=0;i<documentFragment.childNodes.length;i++){
        var childNode = documentFragment.childNodes[i];
        if(childNode.nodeType==3){ // Text 节点
            selectedHtml+=childNode.nodeValue;
        }else{
            var nodeHtml = childNode.outerHTML;
            selectedHtml+=nodeHtml;
        }

    }

}catch(err){

}

return selectedHtml;

}