Go运行时如何用Go编写？(How is it possible for the Go runtime to be written in Go?)

 显然，您无法直接修改search-theme-form.tpl.php的HTML，因为这不是正确的方法。 所以我添加类和onFocus和onBlur属性是问题所在。 
 
 正确的方法是修改主题template.php文件。 基本上我们将使用form_alter（）来修改表单元素。 由于使用HTML方式是错误的。 看看下面的代码（取自： 这里 ） 
 
<?php
/**
* Override or insert PHPTemplate variables into the search_theme_form template.
*
* @param $vars
*   A sequential array of variables to pass to the theme template.
* @param $hook
*   The name of the theme function being called (not used in this case.)
*/
function yourthemename_preprocess_search_theme_form(&$vars, $hook) {
  // Note that in order to theme a search block you should rename this function
  // to yourthemename_preprocess_search_block_form and use
  // 'search_block_form' instead of 'search_theme_form' in the customizations
  // bellow.

  // Modify elements of the search form
  $vars['form']['search_theme_form']['#title'] = t('');

  // Set a default value for the search box
  $vars['form']['search_theme_form']['#value'] = t('Search this Site');

  // Add a custom class and placeholder text to the search box
  $vars['form']['search_theme_form']['#attributes'] = array('class' => 'NormalTextBox txtSearch', 
                                                              'onfocus' => "if (this.value == 'Search this Site') {this.value = '';}",
                                                              'onblur' => "if (this.value == '') {this.value = 'Search this Site';}");

  // Change the text on the submit button
  //$vars['form']['submit']['#value'] = t('Go');

  // Rebuild the rendered version (search form only, rest remains unchanged)
  unset($vars['form']['search_theme_form']['#printed']);
  $vars['search']['search_theme_form'] = drupal_render($vars['form']['search_theme_form']);

  $vars['form']['submit']['#type'] = 'image_button';
  $vars['form']['submit']['#src'] = path_to_theme() . '/images/search.jpg';

  // Rebuild the rendered version (submit button, rest remains unchanged)
  unset($vars['form']['submit']['#printed']);
  $vars['search']['submit'] = drupal_render($vars['form']['submit']);

  // Collect all form elements to make it easier to print the whole form.
  $vars['search_form'] = implode($vars['search']);
}
?>
 
 在yourthemename_preprocess_search_theme_form - 'yourthemename'显然会反映您的自定义主题的名称。 基本上代码是不言自明的。 什么评论和所有。 
 
 所以，基本上就是它的工作方式。 

Apparently, you cannot directly modify the HTML in search-theme-form.tpl.php since thats not the right way to do it. So my adding the class and onFocus and onBlur attributes was the problem.
 
The correct way to do it is to modify the themes template.php file. Basically we will be using form_alter() to modify the form elements. Since using the HTML way is wrong. Take a look at the code below (taken from : here )
 
<?php
/**
* Override or insert PHPTemplate variables into the search_theme_form template.
*
* @param $vars
*   A sequential array of variables to pass to the theme template.
* @param $hook
*   The name of the theme function being called (not used in this case.)
*/
function yourthemename_preprocess_search_theme_form(&$vars, $hook) {
  // Note that in order to theme a search block you should rename this function
  // to yourthemename_preprocess_search_block_form and use
  // 'search_block_form' instead of 'search_theme_form' in the customizations
  // bellow.

  // Modify elements of the search form
  $vars['form']['search_theme_form']['#title'] = t('');

  // Set a default value for the search box
  $vars['form']['search_theme_form']['#value'] = t('Search this Site');

  // Add a custom class and placeholder text to the search box
  $vars['form']['search_theme_form']['#attributes'] = array('class' => 'NormalTextBox txtSearch', 
                                                              'onfocus' => "if (this.value == 'Search this Site') {this.value = '';}",
                                                              'onblur' => "if (this.value == '') {this.value = 'Search this Site';}");

  // Change the text on the submit button
  //$vars['form']['submit']['#value'] = t('Go');

  // Rebuild the rendered version (search form only, rest remains unchanged)
  unset($vars['form']['search_theme_form']['#printed']);
  $vars['search']['search_theme_form'] = drupal_render($vars['form']['search_theme_form']);

  $vars['form']['submit']['#type'] = 'image_button';
  $vars['form']['submit']['#src'] = path_to_theme() . '/images/search.jpg';

  // Rebuild the rendered version (submit button, rest remains unchanged)
  unset($vars['form']['submit']['#printed']);
  $vars['search']['submit'] = drupal_render($vars['form']['submit']);

  // Collect all form elements to make it easier to print the whole form.
  $vars['search_form'] = implode($vars['search']);
}
?>
 
In yourthemename_preprocess_search_theme_form - 'yourthemename' will obviously reflect the name of your custom theme. Basically the code is self-explanatory. what with the comments and all.
 
So, basically thats the way it works.