egret游戏进度条实现

class LoadingUI extends eui.Component{


    public lamp: eui.Component;
    public light: eui.Component;
    public loading: eui.Component;
    
    public constructor() {
        super();
        this.skinName = "resource/loading/loading.exml";
        this.lamp.alpha = 0;
        this.light.alpha = 0;
        this.loading.alpha = 1;
        egret.Tween.get(this.loading,{ loop: true }).to({ alpha: 0 },1500);
    }


    public setProgress(current, total):void {
        var start = 0.2;
        if(current/total > 0.1){
            this.lamp.alpha = 1;
            this.light.alpha = start;
        }
        this.light.alpha = start + (1 - start)*(current / total);
        console.log(this.light.alpha);
    }
}