奇怪的javascript变量转储

当调用console.dir(myVariable)时，我得到了这个奇怪的结果:

JS: === dump(): dumping function and properties names  ===                                                                          
JS: 0:  [                                                                                                                           
JS: 1: o                                                                                                                           
JS: 2: b                                                                                                                           
JS: 3: j                                                                                                                           
JS: 4: e                                                                                                                           
JS: 5: c                                                                                                                           
JS: 6: t                                                                                                                           
JS: 7:                                                                                                                             
JS: 8: O                                                                                                                           
JS: 9: b                                                                                                                           
JS: 10: j                                                                                                                          
JS: 11: e                                                                                                                          
JS: 12: c                                                                                                                          
JS: 13: t 
JS: 14: ]
JS: === dump(): finished ===          

这是什么意思?为什么我没有得到一个标准的对象或数组输出?

请注意，我不能使用chrome/firefox开发工具，因为我是从Telerik NativeScript框架编码的。

另外，我是从Angular 2中构建的组件的"code - behind"中调用这些代码的。

这是浏览器组件的html, explorer.html:

<ActionBar title="{{ 'activity_explorer' | L }}" android.icon="res://icon"
    android.iconVisibilty="always">
    <ActionItem icon="res://icon_plus" text="{{'menuitem_new' | L}}" (tap)="showMenuItemNew()"></ActionItem>
    <ActionItem [icon]="selectionModeIcon()" text="selectionModeItemText()" (tap)="toggleSelectionMode()"></ActionItem>
</ActionBar>
<GridLayout rows="1*, 12*" modal-dialog-host>
    <Label class="path_component" row="0" [text]="_path" textWrap="true"> </Label>
    <ListView row="1" [items]="_files">
        <template let-item="item">
            <loloof64-explorer-item-line [checkboxVisible]="_selectionMode" item="{{item}}"></loloof64-explorer-item-line>
        </template>
    </ListView>
 </GridLayout>

这是explorer_item_line组件的html:

<GridLayout columns="1*, 1*, 7*">
    <loloof64-checkbox #check_comp col="0" [visible]="checkboxVisible"> </loloof64-checkbox>
    <Image col="1"  (tap)="handleTap()" src="res://folder"></Image>
    <Label col="2"  (tap)="handleTap()" text="Text" textWrap="true">   </Label>
</GridLayout>

这是exploreritem类:

export class ExplorerItem {
    private _name: string;
    private _isDirectory: boolean;
    constructor(name: string, isDirectory: boolean){
        this._name = name;
        this._isDirectory = isDirectory;
    }
    name(){
        return this._name;
    }
    isDirectory(){
        return this._isDirectory;
    }
    public isParent() : boolean {
        return this._name === ".." && this._isDirectory;
    }
    public static sort(left: ExplorerItem, right: ExplorerItem): number {
        if (left.isDirectory() === right.isDirectory()) { 
            return left.name().toLowerCase().localeCompare(right.name().toLowerCase());
        }
        else {
            return left.isDirectory() ? -1 : 1;
        }
    }
}

这是explorer_item_line。ts:

import {Component, Input, ViewChild} from '@angular/core';
import {Checkbox} from "../checkbox/checkbox";
import {ExplorerItem} from "./explorer_item";
import * as _ from 'lodash';
@Component({
    moduleId: module.id,
    selector: 'loloof64-explorer-item-line',
    templateUrl: 'explorer_item_line.html',
    styleUrls: ['explorer_item_line.css'],
    directives: [Checkbox]
})
export class ExplorerItemLine {
    @Input() checkboxVisible: boolean = false;
    @Input() item: any;
    @ViewChild('check_comp') checkboxComp: Checkbox;
    handleTap(){
        if (this.checkboxVisible){
            this.checkboxComp.checked = ! this.checkboxComp.checked;
        }
        console.log(JSON.stringify(this.item))
    }
}

我认为这是浏览器和explorer_item_line组件之间的绑定问题，但我不知道为什么以及如何解决它。

最后，我登陆了原生脚本调试页面:所以我应该能够在Chrome的开发人员工具中检查它。