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--]);
                    }
                }
            }