anchor.diff:    }
   
     void present16(Event e, var detail, Node target) {
  -
  +    select = $['select'];
  +    var s=$['text'];
  +    var s2=$['textarea2'];
  +    var s8 =$['textarea8'];
  +    var s10 = $['textarea10'];
  +    var s16=$['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);
  +      cal_10_to_draw(16,ss);
  +    }
  +    else if (select.options[select.selectedIndex].value == "8") {
  +      var ss = cal_to_10(8,s).toString();
  +      cal_to_10_draw(8,s.value);
  +      cal_10_to_draw(16,ss);
  +    }
  +    else if (select.options[select.selectedIndex].value == "10") {
  +      cal_10_to_draw(16,s.value);
  +    }
  +    else if (select.options[select.selectedIndex].value == "16") {
  +    }
  +    else {
  +      window.alert('Please choose the right number!!');
  +    }
     }
   
     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
  
positive.code:     content.clearRect(0,0,450,570);
    }
  
  }
  
  
  
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!!');
  