不確定是不是你要的結果，我有稍為寫個demo在這:http://jsfiddle.net/9zBFU/2/

html code:

<pre class="c" name="code">
<form>
<input type="text" placeholder="所選取的值" name="all_selected_value" id="all_selected_value">
<div id="all_value_temp"></div>
    <input type="checkbox" name="number" value="1">1<br>
    <input type="checkbox" name="number" value="2">2<br>
    <input type="checkbox" name="number" value="3">3<br>
    <input type="checkbox" name="number" value="4">4<br>           
    <input type="checkbox" name="number" value="5">5<br>
    <input type="checkbox" name="number" value="6">6<br>
    <input type="checkbox" name="number" value="7">7<br>
    <input type="checkbox" name="number" value="8">8<br>
    <input type="checkbox" name="number" value="9">9<br>
    <input type="checkbox" name="number" value="10">10<br>
    <button id="sure" value="確定">確定</button>
</form>

js code

<pre class="c" name="code">
$('document').ready(function(){
  $('input[type="checkbox"]').change(function(){
     var new_all_selected_val = [];
     var result = new Array;
         new_all_selected_val = $('input[type="checkbox"]:checked');
         //console.log('被chedked的總各數為'+new_all_selected_val.length);
       for(var i = 0;i<new_all_selected_val.length;i++){
         //console.log("被選取的值包含 :"+($('input[type="checkbox"]:checked:eq('+i+')').attr('value')));
          result.push($('input[type="checkbox"]:checked:eq('+i+')').attr('value')+',');
         $('#all_value_temp').html(result);
         var final_value =  $('#all_value_temp').html().replace(/,([^,]*)$/,'$1'); 
       }
       $('#sure').click(function(){
       //當確定被按下時
        $('#all_selected_value').attr('value',final_value);
        return false; 
        //避免跳頁
       });
     });
});