LayaBox 3D 动画播放/倒放Bug问题解决

LayaBox 动画可以直接使用Unity 导出的动画，但是奇怪的问题发生了，当我将动画倒放时，居然会出现无限循环播放。不知道是不是我调错接口了，跑进Laya的接口和文档中查了N久，无功而返。意识到可能又是源码bug了。

跑进去调试一下果然发现了问题所在。

直接修改 laya.d3.js 文件中  _updatePlayer 函数即可

/**
 *@private
 */
__proto._updatePlayer = function (animatorState, playState, elapsedTime, islooping) {
    var clipDuration = animatorState._clip._duration * (animatorState.clipEnd - animatorState.clipStart);
    var lastElapsedTime = playState._elapsedTime;
    var elapsedPlaybackTime = lastElapsedTime + elapsedTime;
    playState._lastElapsedTime = lastElapsedTime;
    playState._elapsedTime = elapsedPlaybackTime;
    var normalizedTime = elapsedPlaybackTime / clipDuration;
    playState._normalizedTime = normalizedTime;
    var playTime = normalizedTime % 1.0;
    playState._normalizedPlayTime = playTime < 0 ? playTime + 1.0 : playTime;
    playState._duration = clipDuration;
    var scripts = animatorState._scripts;
    // 修改后代码 [SixGod-Modify 2020年11月4日14:42:26]
    if ((!islooping && Math.abs(elapsedPlaybackTime) >= clipDuration)) {
        playState._finish = true;
        playState._elapsedTime = clipDuration;
        if (elapsedPlaybackTime > 0) {
            playState._normalizedPlayTime = 1.0;
        } else {
            playState._normalizedPlayTime = 0.0;
        }
        if (scripts) {
            for (var i = 0, n = scripts.length; i < n; i++)
                scripts[i].onStateExit();
        }
        return;
    }
    // 源码
    // if ((!islooping && elapsedPlaybackTime >=clipDuration)){
    //     playState._finish=true;
    //     playState._elapsedTime=clipDuration;
    //     playState._normalizedPlayTime=1.0;
    //     if (scripts){
    //         for (var i=0,n=scripts.length;i < n;i++)
    //         scripts[i].onStateExit();
    //     }
    //     return;
    // }
    if (scripts) {
        for (i = 0, n = scripts.length; i < n; i++)
            scripts[i].onStateUpdate();
    }
}