anchor.diff:      content.clearRect(0,0,450,570);
     }
   
  -}
  -
  -
  +}
positive.code:   }
  
    void present16(Event e, var detail, Node target) {
  
    }
  
    int cal_to_10_draw(int jz, var input) {    //将其他进制转换为10进制的图画画出来
  
negative.code:     var s16=$['textarea16'];
      canvasClear();
      if (select.options[select.selectedIndex].value == "2") {    //将2进制转换成8进制
        var ss = cal_to_10(2,s).toString();
        cal_to_10_draw(2,s.value);
        cal_10_to_draw(8,ss);
      }
      else if (select.options[select.selectedIndex].value == "8") {
        //null
      }
      else if (select.options[select.selectedIndex].value == "10") {
        cal_10_to_draw(8,s.value);
      }
      else if (select.options[select.selectedIndex].value == "16") {
        var ss = cal_to_10(16,s).toString();
        cal_to_10_draw(16,s.value);
        cal_10_to_draw(8,ss);
      }
      else {
        window.alert('Please choose the right number!!');
  