删除空白节点

function removeWhitespace(element){
                var loopIndex;
                for (loopIndex = 0; loopIndex < element.childNodes.length; loopIndex++) {
                    var currentNode = element.childNodes[loopIndex];
                    if (currentNode.nodeType == 1) {
                        removeWhitespace(currentNode);
                    }
                    if (((/^\s+$/.test(currentNode.nodeValue))) && (currentNode.nodeType = 3)) {
                        element.removeChild(element.childNodes[loopIndex--]);
                    }
                }
            }