AS3.0计数器-学习作业

var arr_sf:Array=["+","-","*","/"];
sr1_txt.restrict="0-9";
sr2_txt.restrict="0-9";
//xs_txt.visible=false
bk.htmlText="<a href=\'http://1hujinjin1.blog.163.com\'>博客：http://1hujinjin1.blog.163.com/</a>"
for (var i:int=1; i<arr_sf.length+1; i++) {
  this["btn"+i]._txt.text=arr_sf[i-1];
  this["btn" + i].addEventListener(MouseEvent.CLICK,sf);
}
function sf(event:Event) {
  if (sr1_txt.text=="" || sr2_txt.text=="" ) {
   pd_jg.text="数字1和数字2都不能为空";
  } else {
   switch (event.target.text) {
    case "+" :
     pd_jg.text="计算结果："+(int(sr1_txt.text)+int(sr2_txt.text)).toString();
//    xs_txt.text=(int(sr1_txt.text)+int(sr2_txt.text)).toString();
     break;
    case "-" :
     pd_jg.text="计算结果："+(int(sr1_txt.text)-int(sr2_txt.text)).toString();
     break;
    case "*" :
     pd_jg.text="计算结果："+(int(sr1_txt.text)*int(sr2_txt.text)).toString();
     break;
    case "/" :
     pd_jg.text="计算结果："+(int(sr1_txt.text)/int(sr2_txt.text)).toString();
     break;
   }
  }
}