javascript中怎么将xml转为json

/**

 * 将XML的Document对象转换为JSON字符串

 * @param xmlDoc xml的Document对象

 * @return string

 */

function convertToJSON(xmlDoc) {

    //准备JSON字符串和缓存（提升性能）

    var jsonStr = "";

    var buffer = new Array();

    buffer.push("{");

    //获取xml文档的所有子节点

    var nodeList = xmlDoc.childNodes;

    generate(nodeList);

    /**

     * 中间函数，用于递归解析xml文档对象，并附加到json字符串中

     * @param node_list xml文档的的nodeList

     */

    function generate(node_list) {

        for (var i = 0; i < node_list.length; i++) {

            var curr_node = node_list[i];

            //忽略子节点中的换行和空格

            if (curr_node.nodeType == 3) {

                continue;

            }

            //如果子节点还包括子节点，则继续进行遍历

            if (curr_node.childNodes.length > 1) {

                buffer.push("\"" + curr_node.nodeName + "\": {");

                generate(curr_node.childNodes);

            } else {

                var firstChild = curr_node.childNodes[0];

                if (firstChild != null) {

                    //nodeValue不为null

                    buffer.push("\"" + curr_node.nodeName + "\":\"" + firstChild.nodeValue + "\"");

                } else {

                    //nodeValue为null

                    buffer.push("\"" + curr_node.nodeName + "\":\"\"");

                }

            }

            if (i < (node_list.length - 2)) {

                buffer.push(",");

            } else {

                break;

            }

        }

        //添加末尾的"}"

        buffer.push("}");

    }

    jsonStr = buffer.join("");

    return jsonStr;

}