egret createchild，childrencreate与addtostage比较

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1.createChildren是皮肤初始化创建和添加组件调用
2.childrenCreated是在组件初始化完成后回调
3.addtostage是被addchild到舞台的时候执行
例1：

class TestSkin extends eui.Component {
    constructor() {
        super();
        this.addEventListener(eui.UIEvent.COMPLETE,this.onComplete,this);
        this.skinName = "resource/testSkin.exml";
    }
    protected createChildren() {
        super.createChildren();
        console.log("11111111")
    }
    private onComplete():void{
        console.log("222222222");
    }
}

先输出111111，后输出222222，可见执行createChildren时是取不到皮肤上的组件的。
例2：主题加载皮肤

{
  "skins": {
    "eui.Button": "skins/ButtonSkin.exml",
    "eui.CheckBox": "skins/CheckBoxSkin.exml",
    "eui.HScrollBar": "skins/HScrollBarSkin.exml",
    "eui.HSlider": "skins/HSliderSkin.exml",
    "eui.Panel": "skins/PanelSkin.exml",
    "eui.ProgressBar": "skins/ProgressBarSkin.exml",
    "eui.RadioButton": "skins/RadioButtonSkin.exml",
    "eui.Scroller": "skins/ScrollerSkin.exml",
    "eui.ToggleSwitch": "skins/ToggleSwitchSkin.exml",
    "eui.VScrollBar": "skins/VScrollBarSkin.exml",
    "eui.VSlider": "skins/VSliderSkin.exml"
  },
  "exmls": [ ],
  "autoGenerateExmlsList": true
}

使用例1的代码先输出22222，再输出11111