关于内容的WordPress esc_html

I have this code:

the_content( sprintf(
                __( 'Continue reading %s', 'twentyfifteen' ),
                the_title( '<span class="screen-reader-text">', '</span>', false )
            ) );

How to escape the code above for security issue? I have been using the code below to fix issues:

<?php echo esc_html(get_the_title()) ; ?>

From the WP Codex:

It's important to note that most WordPress functions properly prepare the data for output, and you don't need to escape again.

So for this function you don't have to escape the_title() again because this function does it already by itself.

For all other Escaping/Sanitizing needs, look here.

the_title(), the_excerpt() and the_content() are not escaped (the_content() does a little string replacing) and this can cause security issues for example when an editor has installed malicious browser extensions.

The correct approach is to wrap the get_* versions of these functions into esc_html_e() (which runs esc_html(), translates through the text domain, and echo's the result), so in your case:

<?php esc_html_e(get_the_content($more_link_text, $strip_teaser)); ?>