callaction.js

//You can actually wrap the function into Javascript
//in order to make the counts valid if an user clicks on a button or title (<h1></h1>;<div></div>)
//not just on the refresh of the post/page
  document.getElementById("readmore").addEventListener("click", function( event ) {
    // display the current click count inside the clicked div
    event.target.textContent = "click count: " + event.detail;
  }, false);

viewsperpost.php

<?php
/*
This php block goes into your functions.php file.
Notice that if you're using the WP Super Cache plugin by Auttomatic, it will affect the function. Deactivate it if neccesary.
*/
// function to display number of posts.
function getPostViews($postID){
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
        return "0 Views";
    }
    return $count.' Views';
}

// function to count views.
function setPostViews($postID) {
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        $count = 0;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
    }else{
        $count++;
        update_post_meta($postID, $count_key, $count);
    }
}


// Add it to a column in WP-Admin
add_filter('manage_posts_columns', 'posts_column_views');
add_action('manage_posts_custom_column', 'posts_custom_column_views',5,2);
function posts_column_views($defaults){
    $defaults['post_views'] = __('Views');
    return $defaults;
}
function posts_custom_column_views($column_name, $id){
	if($column_name === 'post_views'){
        echo getPostViews(get_the_ID());
    }
}
?>
<?php 
// You  have to call the function using this echo if you want to put it in the index,archive, or search file. It needs to be put inside the loop
echo getPostViews(get_the_ID());
?>
<?php
// This one goes in the single,page files. If you do not put it will trow an error, and/or the function may not work properly. It needs to go inside the loop
setPostViews(get_the_ID());
?>