json 平面转树状 child [zhuan]

<script>
/** 
 * json格式转树状结构
 * @param   {json}      json数据
 * @param   {String}    id的字符串
 * @param   {String}    父id的字符串
 * @param   {String}    children的字符串
 * @return  {Array}     数组
 */
function transData(a, idStr, pidStr, chindrenStr) {
    var r = [],
        hash = {},
        id = idStr,
        pid = pidStr,
        children = chindrenStr,
        i = 0,
        j = 0,
        len = a.length;
    for (; i < len; i++) {
        hash[a[i][id]] = a[i];
    }
    for (; j < len; j++) {
        var aVal = a[j],
            hashVP = hash[aVal[pid]];
        if (hashVP) {
            !hashVP[children] && (hashVP[children] = []);
            hashVP[children].push(aVal);
        } else {
            r.push(aVal);
        }
    }
    return r;
}

var jsonData = [
	{"id":"4","pid":"1","name":"大家电"},
	{"id":"5","pid":"1","name":"生活电器"},
	{"id":"1","pid":"0","name":"家用电器"},
	{"id":"2","pid":"0","name":"服饰"},
	{"id":"3","pid":"0","name":"化妆"},
	{"id":"7","pid":"4","name":"空调"},
	{"id":"8","pid":"4","name":"冰箱"},
	{"id":"9","pid":"4","name":"洗衣机"},
	{"id":"10","pid":"4","name":"热水器"},
	{"id":"11","pid":"3","name":"面部护理"},
	{"id":"12","pid":"3","name":"口腔护理"},
	{"id":"13","pid":"2","name":"男装"},
	{"id":"14","pid":"2","name":"女装"},
	{"id":"15","pid":"7","name":"海尔空调"},
	{"id":"16","pid":"7","name":"美的空调"},
	{"id":"19","pid":"5","name":"加湿器"},
	{"id":"20","pid":"5","name":"电熨斗"}
	];

var jsonDataTree = transData(jsonData, 'id', 'pid', 'chindren');
console.log(jsonDataTree);
</script>