[Flash Basic theory Class 09] stars and Changing lines [onenterframe]

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Example 1:

Train of thought: 1. Use setinterval timer, constantly call the function of copying stars;

2. After each star is created, it continuously reduces its own _alpha until 0.

Step 1:

Draw a star, Save as a movie clip, and connect-> Export the-> marker "star".

Step 2:

Add as code:

var n:Number = 0;
//初始化,复制影片的记数器n
setInterval(CreateStar, 200);
//每200毫秒，调用一次函数CreateStar()
function CreateStar() {
　p = _root.attachMovie("Star", "Star" + n, n);
　//用指针p指向，复制出的影片"Star"+n，此时p就等于"Star"+n
　p._x = random(400);
　p._y = random(200);
　//随机设置当前p所指的影片的坐标
　p.onEnterFrame = function() {
　　//"Star" + n 的 onEnterFrame 中不断降低该影片的 _alpha 直至 0
　　this._alpha -= 5;
　　if (this._alpha < 0) {
　　　this.removeMovieClip();
　　　delete this.onEnterFrame;
　　　//影片的 _alpha 小于 0 时，影片就没有存在的意义了，直接删除这个影片
　　}
　};
　n++;
}

Attention:

MC.onEnterFrame = function() {
　this._x += 2;
　this._y += 3;
　this._rotaion += 3;
};

//this指的就是MC,也就是调用这个函数的实例名。