.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。

$('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.

: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

在迷失在这个页面上无数的答案之后，没有一个真正有效，我找到了如何在我的情况下做到这一点。

出于某种原因，在选择器中使用输入并没有做到这一点。我在表单元素上没有ID，所以我不能为选择器使用任何ID。即使我做了，我也肯定不会成功。

以下是我的解决方案:

$("[name=something]").val("something");

基本上，选择名称为“something”的任何元素。试试看吧。

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.

最后，我找到了一个解决方案，很简单:

document.getElementById("texens").value = "tinkumaster";

效果非常好。不知道为什么jQuery没有退回到这一步。