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<form action="fin" method="post" enctype="multipart/form-data">
<input name="orderData.optDis.id" value="${i.id!}" style="display:none;" id="disid"></span>
<td nowrap="" style="max-width:100px;overflow: hidden;"><input name="orderData.sign" value="${i.sign!}" id="sign"></span></td>
<td nowrap="" style="max-width:100px;overflow: hidden;"><input name="orderData.signTime" value="${i.time_sign!}" id="signtime" onClick="WdatePicker({dateFmt:'yyyy-MM-dd'})"></td>
<td><input id="file" name="orderData.img" value="${data.imgFileName!}" type="file" class="txt1"></input></td>
<td nowrap="" style="max-width:200px;overflow: hidden;">${i.atta!}</td>
<td nowrap="" style="max-width:200px;overflow: hidden;">${i.time_dis!?string("yyyy-MM-dd")}</td>
<td nowrap="" style="max-width:100px;overflow: hidden;">${i.num!}</td>
<td><input type="button" class="submit-btn" value="保存" id="submit-btn" onClick="sub(this.form)"/></td>
</form>
function sub(tag){
alert("把id=sign"的值alert出来);
}

var o=$('input[id="sign"]');///
alert(o.eq(1).val())