Actually, this is an ongoing problem. While Andy is right about the downloaded source, .val(...) and .attr('value',...) don't seem to actually modify the html. I think this is a javascript problem and not a jquery problem. If you had used firebug even you would have had the same question. While it seems that if you submit the form with the modified values it will go through, the html does not change. I ran into this issue trying to create a print preview of the modified form (doing [form].html()) it copies everything okay, including all changes except values changes. Thus, my modal print preview is somewhat useless... my workaround may have to be to 'build' a hidden form containing the values they have added, or generate the preview independently and make each modification the user makes also modify the preview. Both are inoptimal, but unless someone figures out why the value-setting behavior does not change the html (in the DOM i'm assuming) it will have to do.

.val没有为我工作，因为我抓取值属性服务器端和值并不总是更新。所以我用了:

var counter = 0;
$('a.myClickableLink').click(function(event){
   event.preventDefault();
   counter++;

   ...
   $('#myInput').attr('value', counter);
}

希望它能帮助到别人。

又有人在这里抓你了，浪费了我的时间，所以我想我应该把这个建议给你。我有一个隐藏字段，我给了一个id。名称中的[]括号(由于与struts2一起使用)和选择器$(“#model.thefield[0]”)不会找到我的隐藏字段。将id重命名为不使用句号和括号会导致选择器开始工作。因此，最后我以model_the_field_0的id代替，选择器工作正常。

$('input[name=hidden_field_name]').val('newVal');

为我工作，其实两者都不是

$('input[id=hidden_field_id]').val('newVal');

nor

$('#hidden_field_id').val('newVal');

did.

在我的情况下，我使用了一个非字符串(整数)作为val()的参数，这并不管用，技巧就像

$("#price").val('' + price);

:text对于type值为hidden的输入将失败。只使用以下语句也会更有效率:

$("#texens").val("tinkumaster");

ID属性在网页上应该是唯一的，确保你的ID属性是唯一的，因为这可能会导致你遇到的任何问题，指定一个更复杂的选择器只会减慢速度，看起来不那么整洁。

http://jsbin.com/elovo/edit上的示例，使用http://jsbin.com/elovo/2/edit上的示例代码