请帮我看看这段代码有没有问题？为什么总是说错误呢？
a=random(100);
while(Number(a)<=100){
a=Number(a)+1;
setProperty("/snow",_x,random(500));
setProperty("/snow",_y,random(400));
setProperty("/snow",_xscale,random(50));
setProperty("/snow",_yscale,random(50));
setProperty("/snow",_rotation,random(360));
duplicateMovieClip("/snow","snow_"add a,a);
}
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