In WordPress excerpts seem to be a feature exclusively for posts. But some users might want to use it for Pages as well. Even though WordPress supports Page excerpts internally as it has the same database field as the post excerpts, it provides no option to add excerpts to pages through the WordPress admin panel. In this article we will share a plugin that adds an excerpt box for your pages similar to the one for your posts.
Open your theme’s functions.php file and add the following code:
add_action( 'init', 'my_add_excerpts_to_pages' );
function my_add_excerpts_to_pages() {
add_post_type_support( 'page', 'excerpt' );
}
Alternatively, you can install a plugin called PJW Page Excerpt which will add the same excerpt box to your page editor like your post editor has.

here is a nice example for post and page excerpts http://addall.in/reference/get-the-page-excerpt-wo...
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