在第二次调用geteneration时，集合还没有初始化

我尝试在SharePoint中接收一个用户的子网页。在第一次调用接收子网站时(函数getSubWebs())，一切正常:子网站被接收，我可以遍历它们。

然而，我尝试使用相同类型的代码获得这些网站的子网站var webSubEnumerator = subwebcollection . getenenumerator ();抛出错误

The collection has not been initialized

尽管我之前使用了Load()，并且在ExecuteQueryAsync的"success"部分(就像在web父请求上一样)。

是什么导致这里的问题?

var context = SP.ClientContext.get_current();
var user = context.get_web().get_currentUser();
var web = context.get_web();
var lists = web.get_lists();
var parrentwebCollection = null;
ExecuteOrDelayUntilScriptLoaded(getSubWebs, "sp.js"); 
function getSubWebs(){
  parrentwebCollection = web.getSubwebsForCurrentUser(null);
  context.load(parrentwebCollection)
  context.executeQueryAsync(onGetSubwebsSuccess, onGetSubwebsFail);
}
function onGetSubwebsSuccess(sender, args){
  var webEnumerator = parrentwebCollection.getEnumerator();
  // Everything works FINE on this getEnumerator()
  while (webEnumerator.moveNext()){
    var webParrent = webEnumerator.get_current();
    var parrenttitel = webParrent.get_title();
    var parrenturl = webParrent.get_url();
    //Load Subs From Parrent
    var subwebCollection = null;
    subwebCollection = webParrent.getSubwebsForCurrentUser(null);
    if (subwebCollection != undefined && subwebCollection != null) { 
      context.load(subwebCollection);
      context.executeQueryAsync(onGetSSubwebsSuccess, onGetSSubwebsFail);
      function onGetSSubwebsSuccess(sender, args) {
        console.log("getSubWebs query successful")
        var webSubEnumerator = subwebCollection.getEnumerator();
        // THIS getEnumerator(), however throws an exception
        while (webSubEnumerator.moveNext()){
          console.log("After While")
          var subweb = webSubEnumerator.get_current();
          var subtitel = subweb.get_title();
        }              
      }
      function onGetSSubwebsFail(sender, args){
        alert("Request to retrieve subwebs failed. Error: " + args.get_message())
      }
    }
  }              
}
function onGetSubwebsFail(sender, args){
  alert("Request to retrieve subwebs failed. Error: " + args.get_message())
}

请注意，我在executeQueryAsync().的Success()-函数内，所以我相信这不是典型的"在它存在之前试图读取异步数据"-问题。

function onGetSubwebsSuccess(sender, args) {
    var webEnumerator = parentwebCollection.getEnumerator();
    while (webEnumerator.moveNext()) {
        var webparent = webEnumerator.get_current();
        var parenttitle = webparent.get_title();
        (function(){ /* anonymous function expression wraps the subwebCollection variable in a closure (creates a new scope for the variable) */
            var subwebCollection = null;
            subwebCollection = webparent.getSubwebsForCurrentUser(null);
            if (subwebCollection != undefined && subwebCollection != null) {
                context.load(subwebCollection);
                context.executeQueryAsync(onGetSSubwebsSuccess, onGetSSubwebsFail);
                function onGetSSubwebsSuccess(sender, args) {
                    console.log("getSubWebs query successful")
                    var webSubEnumerator = subwebCollection.getEnumerator();
                    while (webSubEnumerator.moveNext()) {
                        console.log("After While")
                        var subweb = webSubEnumerator.get_current();
                        var subtitel = subweb.get_title();
                    }
                }
                function onGetSSubwebsFail(sender, args) {
                    alert("Request to retrieve subwebs failed. Error: " + args.get_message())
                }
            }
        })(); /* we immediately invoke the function expression */
    }
}

(function(){
    // closure
})();