点击复选框时填写,再点击取消填写

 <table border="0" cellpadding="4" align="center" cellspacing="1" class="table">
   <tr><td colspan="4"><center><font size="+1">11111111</font></center></td><tr/>
   <tr>
    <td colspan="4">
     <div id="reason">
    　　　<input type="checkbox" οnclick="addReason(this, 1);" id="c1"
     class="tbbutton" style="width: 20px" />
    <span id="s1">2222222；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 2);" id="c2"class="tbbutton" style="width: 20px" /><span id="s2">33333333；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 3);" id="c3"
     class="tbbutton" style="width: 20px" />
    <span id="s3">与44444444444；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 4);" id="c4"
     class="tbbutton" style="width: 20px" />
    <span id="s4">5555555555555</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 5);" id="c5"
     class="tbbutton" style="width: 20px" />
    <span id="s5">6666666666666；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 6);" id="c6"
     class="tbbutton" style="width: 20px" />
    <span id="s6">7777777777777；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 7);" id="c7"
     class="tbbutton" style="width: 20px" />
    <span id="s7">888888888888</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 8);" id="c8"
     class="tbbutton" style="width: 20px" />
    <span id="s8">999999999999；</span>
    <br />
    　　　<input type="checkbox" οnclick="addReason(this, 9);" id="c9"
     class="tbbutton" style="width: 20px" />
    <span id="s9">00000000000000000</span>
    <br />
   </div>
    </td>
   </tr>　 <tr class="tr">
     <td nowrap class="tdright">
      备注：
     </td>
     <td class="td" colspan="3">
      <textarea id="notstcComment" name="comment" cols="150" rows="6"></textarea>
     </td>
    </tr>
    <tr class="tr">
     <td class="td" colspan="4" align="center" nowrap>
      <input type="button" class="tbbutton" id="notstcConfirmButton"
       οnclick="setNoStc();" value="　确　认　" />
      <input type="button" class="tbbutton" id="cancelButton"
       οnclick="WinClose();" value="关 　闭" />
     </td>
    </tr>　　　　　　　　　　
   
   <table>
 
--------------------------------------------------
 
function addReason(box,index) {
   var comment = document.getElementById("notstcComment").value
   var val1 = document.getElementById("s"+index).innerText;
    //选中
    if(box.checked){ 
     document.getElementById("notstcComment").value=comment+val1+'\n';
    }else{
     document.getElementById("notstcComment").value = trim(comment.replace(val1,''));  //去空格且替换内容
    }
   
   }
 
 
 
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