将代码替换为as。

 <?php
function myplugin_register_settings() 
{
    add_option(\'marker_pin\',\'\');
    register_setting( \'marker_group\', \'marker_pin\', \'myplugin_callback\' );
}
add_action( \'admin_init\', \'myplugin_register_settings\' );
function myplugin_register_options_page() 
{
    add_options_page(\'Google Map\', \'Map\', \'manage_options\', \'Google_map\', \'myplugin_options_page\');
}
add_action(\'admin_menu\', \'myplugin_register_options_page\');
function plugin_admin_enqueue_styles() 
{
    wp_enqueue_script( \'google-maps\', \'https://maps.googleapis.com/maps/api/js?key=AIzaSyBPUcMLet39Rn_MXvOJErCbT7VnsOAVPWc&libraries=places&callback=initMap\', array(\'jquery\'),\'1.0\', true );
    wp_enqueue_script( \'ajax-js\', \'https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\', array(\'jquery\'),\'1.0\', true );
    wp_enqueue_script( \'code-js\', \'https://code.jquery.com/jquery-1.11.3.min.js\', array(\'jquery\'),\'1.0\', true );
}
add_action( \'admin_enqueue_scripts\', \'plugin_admin_enqueue_styles\' );
function myplugin_options_page()
{?>
    <div>
        <?php screen_icon(); ?>
        <h2>My Plugin Page Title</h2>
        <form method="post" action="options.php">
            <?php settings_fields( \'marker_group\' ); ?>
            <h3>This is my option</h3>
            <p>Some text here.</p>
            <table>
                <tr valign="top">
                    <th scope="row"><label for="marker">City:</label></th>
                    <td>
                        <?php  $pins = get_option(\'marker_pin\'); ?>
                        <div id="pac-container">
                            <input id="pac_input" type="text" name="pac_input" placeholder="Enter City" value="<?php echo $pins; ?>">
                        </div>
                    </td>
                </tr>
            </table>
            <?php submit_button(); ?>
            <input type=\'button\' value=\'Add Button\' id=\'addButton\'>
        </form>
    </div><?php
}
function update_option_fn()
{
    if (isset($_POST[\'name_palce\']) && !empty($_POST[\'name_palce\'])) 
    {
       $name=$_POST[\'name_palce\'];
       echo $name;
       update_option(\'marker_pin\',$name);       
    }
}
add_action(\'wp_ajax_update_option_fn\', \'update_option_fn\');
?>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
 <script>
        var place=\'\';
        function initMap() 
        {
            var input = document.getElementById("pac_input");
            var autocomplete = new google.maps.places.Autocomplete(input);
            autocomplete.addListener(\'place_changed\', function() 
            {
                var place = autocomplete.getPlace();
                var placename = place.name;
                input.value=placename;
                if (!place.geometry)
                {
                    alert("No details available for input: \'" + place.name + "\'");
                    return;
                }
            });
        }
        $(document).ready(function() 
        {
            <?php $ajax_nonce = wp_create_nonce( "my-special-string" );?>
            $(\'#pac_input\').focusout(function() 
            {
                var Place =  $(\'#pac_input\').val(); 
                console.log(Place);

                var wp_sec_data_post = { action: \'update_option_fn\', security: \'<?php echo $ajax_nonce; ?>\'};
                var ajaxurl = "<?php echo admin_url(\'admin-ajax.php\')?>";
                wp_sec_data_post2[\'name_palce\'] = Place;
                jQuery.post( ajaxurl, wp_sec_data_post2, function( response ) 
                {
                    console.log("success"+response);                    
                });                
            });
            $("#submit").click(function() 
            {
                var Place =  $(\'#pac_input\').val(); 
                console.log(Place);
                var wp_sec_data_post = { action: \'update_option_fn\', security: \'<?php echo $ajax_nonce; ?>\'};
                var ajaxurl = "<?php echo admin_url(\'admin-ajax.php\')?>";
                wp_sec_data_post2[\'name_palce\'] = Place;
                jQuery.post( ajaxurl, wp_sec_data_post2, function( response ) 
                {
                    console.log("success"+response);                    
                });
            });
        });
</script>