Ztree中simpleData是怎么转换成标准ztree数组对象的

transformTozTreeFormat: function(setting, sNodes) {
var i,l,
key = setting.data.simpleData.idKey,
parentKey = setting.data.simpleData.pIdKey,
childKey = setting.data.key.children;
if (!key || key=="" || !sNodes) return [];

if (tools.isArray(sNodes)) {
var r = [];
var tmpMap = [];
for (i=0, l=sNodes.length; i<l; i++) {
tmpMap[sNodes[i][key]] = sNodes[i];
}
for (i=0, l=sNodes.length; i<l; i++) {
if (tmpMap[sNodes[i][parentKey]] && sNodes[i][key] != sNodes[i][parentKey]) {
if (!tmpMap[sNodes[i][parentKey]][childKey])
tmpMap[sNodes[i][parentKey]][childKey] = [];
tmpMap[sNodes[i][parentKey]][childKey].push(sNodes[i]);
} else {
r.push(sNodes[i]);
}
}
return r;
}else {
return [sNodes];
}
}