好吧，你即将进入最激动人心的Drupal的复杂功能：形式API或简化的FAPI。一些理论先行，然后解决！ ：）

Ok... you are about to enter one of the most exciting and complex features of Drupal: the form API or - for brevity - FAPI. Some theory first, and then the solution! :)

Drupal中的所有表单都由 drupal_get_form（）函数构建，该函数接受一个数组作为参数。数组中的每个字段基本上都是您的表单的一个字段，每个字段都有多个属性，每个字段都定义了该字段的附加特征，例如其默认值（如果是必需或可选），并且 - 是 - 在textfields的情况下...他们必须有多大！您可以在这里找到表单数组结构的详细说明。在drupal网站上。

All forms in Drupal are built by the drupal_get_form() function, that accepts an array as parameter. Each field in the array is basically a field of your form, and each field has a number of proprieties, each of them define additional characteristics of the the field, like for example its default value, if it is required or optional and - yes - in the case of textfields... how large they have to be! You can find a detailed explanation of the structure of form arrays here on the drupal site.

表单API的优点是，呈现该窗体的函数在其构建过程中的各个时刻调用多个钩子过程，所以你可以实现这些钩子，以便在更改表单之前，先将其转换为浏览器。

The beauty of the form API is that the function that renders the form invokes a number of hooks at various moments during its building process, so you can implement these hooks in order to "alter" a form before it is finalised and sent to the browser.

表单更改最常见的钩子是 hook_form_alter（） 和 hook_form_FORM_ID_alter（） 。第一个执行为由drupal引擎处理的任何表单，后者仅适用于名为FORM_ID的特定格式。我不会详细介绍表单API的内部工作，但在这里你可以阅读更多。

The most commonly hooks for form alteration are hook_form_alter() and hook_form_FORM_ID_alter(). The first is executed for any form processed by the drupal engine, the latter only for the specific form named "FORM_ID". I will not get into any more details on the internal working of the form API, but here you can read more.

至于你的具体情况，我假设你正在使用标准的用户块 Drupal的。在这种情况下，我建议您以类似于以下形式实现 hook_form_FORM_ID_alter（）：

As for your specific case, I assume you are using the standard "user block" shipping with Drupal. In this case I suggest you implement hook_form_FORM_ID_alter() in a form similar to this one:

mymodule_form_user_login_block_alter(&$form, $form_state) {
  $form['pass']['#size'] = 43;
}

希望这有帮助！ ：）