Animation Three.js和帧动画跳过

我目前正在使用three.js进行动画项目。我正在使用变形目标，想问一下为什么我的帧经常被跳过？我的动画有7个变形目标，它围绕着它们。它从0到6开始（输出：console.log（'frame:'+lastKeyframe）），但有时我的帧从0跳到3或从1跳到4。。这里到底发生了什么？顺便说一句，动画代码运行良好

[if ( Mesh && playBack ) // exists / is loaded 
{   
    time = new Date().getTime() % duration; //arba Date.now()
    keyframe = Math.floor( time / interpolation ) + animOffset;
    if ( keyframe != currentKeyframe ) 
    {
        Mesh.morphTargetInfluences[ lastKeyframe ] = 0;
        Mesh.morphTargetInfluences[ currentKeyframe ] = 1;
        Mesh.morphTargetInfluences[ keyframe ] = 0;
        //console.log(Mesh.morphTargetInfluences[ 0 ]);
        lastKeyframe = currentKeyframe;
        currentKeyframe = keyframe;

    }
    //The two lines after the if statement interpolate between frames. 
    //The value at currentKeyFrame starts decreasing from 1, and the value at keyFrame starts increasing.
    Mesh.morphTargetInfluences[ keyframe ] = ( time % interpolation ) / interpolation;
    Mesh.morphTargetInfluences[ lastKeyframe ] = 1 - Mesh.morphTargetInfluences[ keyframe ];
    //console.log('current: ' + Mesh.morphTargetInfluences[ keyframe ]);
    console.log('frame: ' + lastKeyframe);

}]

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我想这是因为你是在读挂钟的基础上选择新的框架的。。因此，如果帧速率下降，则可能会丢失一帧