var zm:String="ABCDEFG";
zm_btn.addEventListener(MouseEvent.CLICK ,ckfz);
function ckfz(e) {
var k:uint=Math.random ()*7;
zm_txt.text=zm.substr (k,1);
}
shz_btn.addEventListener(MouseEvent.CLICK ,ckfs);
function ckfs(e) {
var k:uint=Math.random ()*10;
shz_txt.text=String(k);
}
//场景中有两个按钮和两个对应的动态文本框?