Dom节点对象转化为字符串

function nodeToString ( node ) {
var tmpNode = document.createElement( "div" );
tmpNode.appendChild( node.cloneNode( true ) );
var str = tmpNode.innerHTML;
tmpNode = node = null; // prevent memory leaks in IE
return str;
}

var escapedStr = nodeToString( node ).replace( "<" , "<" ).replace( ">" , ">");
outputNode.innerHTML += escapedStr;