我们可以直接用Flash的ASAS代码生成风吹云飘，风吹着青草左右摇摆的动画。因为AS的运算会拖慢机器，所以这里就不提供效果演示了，给大家截个图。

　　制作方法如下。

　　首先建立两个空的影片剪辑cloud和grass。

　　先建立云的影片剪辑（里面什么都不画）

　　选择该元件的第一帧，添加如下代码。

//Number of clouds clouds=6; //These are just general boundaries. //To use exact boundaries, create a mask in the parent level of the size desired //Height of the sky skyheight=Stage.height; //Width of the sky skywidth=Stage.width; //Max size of a cloud cloudsize=300; //Amount of blur applied to the shapes to make them cloud-like blursize=40; //Clouds move at a random speed. this is the minimum speed cloudminspeed=.5; //Variance in speed from cloud to cloud cloudspeedvariance=1; //Create the clouds for(c=1;c<=clouds;c++){ //create an empty movie clip to hold the cloud  this.createEmptyMovieClip("cloud"+c,this.getNextHighestDepth()); //generate a cloud. Pass in the instance name of the newly created cloud  shapecloud("cloud"+c); //Set the x position to a random position within the boundaries  eval("cloud"+c)._x=Math.random()*skywidth-eval("cloud"+c)._x/2; //Set the y position to a random position within the boundaries  eval("cloud"+c)._y=Math.random()*(skyheight)-eval("cloud"+c)._height; } //Run at the start of each frame onEnterFrame=function(){ //Run for each cloud  for(c=1;c<=clouds;c++){ //Move the cloud to the left according to its speed   eval("cloud"+c)._x-=eval("cloud"+c).cloudspeed; //If the cloud is past the stage to the left, reset it to the right. Create a new shape and color     if(eval("cloud"+c)._x+(eval("cloud"+c)._width/2)+cloudsize<0){ //Reset the x position    eval("cloud"+c)._x=skywidth; //Reshape and recolor the cloud    shapecloud("cloud"+c);   }  } } //This function creates the shape and color of a cloud function shapecloud(cloudid){ //Clear the current contents of the cloud  eval(cloudid).clear(); //Set the new shade between 224 and 255. This number is used for the red, green, and blue, to create a grayscale color  cloudcolor=Math.round(Math.random()*31)+224; //Use no line  eval(cloudid).lineStyle(undefined, (cloudcolor+cloudcolor*0x100+cloudcolor*0x10000), 100, false, "none", "none", "none", 1); //Set the fill color. cloudcolor is used 3 times, for red, green, and blue  eval(cloudid).beginFill((cloudcolor+cloudcolor*0x100+cloudcolor*0x10000)); //Set a starting coordinate for the cloud   eval(cloudid).moveTo(Math.random()*cloudsize,Math.random()*cloudsize); //Draw an invisible line to another point the combined lines form shapes, which are the clouds. //They don't look much like clouds until the blur is applied  eval(cloudid).lineTo(Math.random()*cloudsize,Math.random()*cloudsize);  eval(cloudid).lineTo(Math.random()*cloudsize,Math.random()*cloudsize);  eval(cloudid).lineTo(Math.random()*cloudsize,Math.random()*cloudsize);  eval(cloudid).lineTo(Math.random()*cloudsize,Math.random()*cloudsize);  eval(cloudid).lineTo(Math.random()*cloudsize,Math.random()*cloudsize); //Apply a blur to the shape  eval(cloudid).filters = [new flash.filters.BlurFilter(blursize,blursize,2)]; //Set a new cloud speed  eval(cloudid).cloudspeed=Math.random()*cloudspeedvariance+cloudminspeed;  }

　　同样办法再新建立一个草的影片剪辑