我创建了下面的插件，它需要一个js库，但是我试图用这行代码加载插件add_action( \'wp_enqueue_scripts\', \'calc_script\' ); 就地故障并出现错误unexpected T_STRING 感谢您的帮助。

<?php
/**
 * Plugin Name: NME Savings Calculator
 * Description: A widget that displays the potential savings from installing solar panels.
 * Version: 0.1
 * Author: NME
 * Author URI: http://nme.com.au
 */


add_action( \'widgets_init\', \'NME_solar_widget\' );



function NME_solar_widget() {
    register_widget( \'NME_solar_widget\' );
}

class NME_solar_widget extends WP_Widget {

    function NME_solar_widget() {
        $widget_ops = array( \'classname\' => \'example\', \'description\' => __(\'A widget that displays the potential savings from installing solar panels.\', \'example\') );

        $control_ops = array( \'width\' => 300, \'height\' => 350, \'id_base\' => \'example-widget\' );

        $this->WP_Widget( \'example-widget\', __(\'Solar Calculator Widget\', \'example\'), $widget_ops, $control_ops );

    }

    function widget( $args, $instance ) {
        extract( $args );

        //Our variables from the widget settings.
        $title = apply_filters(\'widget_title\', $instance[\'title\'] );
        $name = $instance[\'name\'];
        $daily_kwh = $instance[\'daily_kwh\'];
        $contact_text = $instance[\'contact_text\'];
        $cost_label = $instance[\'cost_label\'];
        $provide_label = $instance[\'provide_label\'];

        echo $before_widget;

        // Display the widget title 
        if ( $title )
            echo $before_title . $title . $after_title;


        //Display the name 

        echo \'<div>\';


            printf( \'<p>\' . __(\'%1$s\', \'example\') . \'</p>\', $name );

            printf( \'<p>\' . __(\'%1$s\', \'example\') . \'&nbsp;<input type="text" id="daily-average" size="8"/> <span id="quote-system-size-daily"> 0 kw </p>\', $daily_kwh );

            printf( \'<p>\' . __(\'%1$s\', \'example\') . \'&nbsp;<input type="text" id="quarter-average" size="8"/> <span id="quote-system-size-quarter"> 0 kw </p>\', $cost_label );

            printf( \'<p><input type="text" id="system-size" size="26"/>&nbsp;\' . __(\'%1$s\', \'example\') . \'<br/><span class="amount" id="quote-savings">\'.\'$0 per year!!\'.\'</p>\', $provide_label );


        echo \'</div>\';

        if ( $contact_text )
        printf( \'<p>\' . __(\'%1$s\', \'example\') . \'</p>\', $contact_text );    

        echo $after_widget;
    }

    //Update the widget 

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;

        //Strip tags from title and name to remove HTML 
        $instance[\'title\'] = strip_tags( $new_instance[\'title\'] );
        $instance[\'name\'] = strip_tags( $new_instance[\'name\'] );
        $instance[\'daily_kwh\'] = strip_tags( $new_instance[\'daily_kwh\'] );
        $instance[\'contact_text\'] = strip_tags( $new_instance[\'contact_text\'] );
        $instance[\'cost_label\'] = strip_tags( $new_instance[\'cost_label\'] );
        $instance[\'provide_label\'] = strip_tags( $new_instance[\'provide_label\'] );

        return $instance;
    }

function calc_script()
{
    wp_register_script( \'calc\', plugins_url( \'/solar/calc.js\',  __FILE__ ), array( \'jquery\' ) );
    wp_enqueue_script( \'calc\' );
}
add_action( \'wp_enqueue_scripts\', \'calc_script\' );

    function form( $instance ) {

        //Set up some default widget settings.
        $defaults = array( \'title\' => __(\'Type text here\', \'example\'), \'name\' => __(\'Type text here\', \'example\'), \'show_info\' => true );
        $instance = wp_parse_args( (array) $instance, $defaults ); ?>


        <p>
            <label for="<?php echo $this->get_field_id( \'title\' ); ?>"><?php _e(\'Headline:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" value="<?php echo $instance[\'title\']; ?>" style="width:100%;" />
        </p>


        <p>
            <label for="<?php echo $this->get_field_id( \'name\' ); ?>"><?php _e(\'Introduction Text:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'name\' ); ?>" name="<?php echo $this->get_field_name( \'name\' ); ?>" value="<?php echo $instance[\'name\']; ?>" style="width:100%;" />
        </p>

        <p>
            <label for="<?php echo $this->get_field_id( \'daily_kwh\' ); ?>"><?php _e(\'Daily KWH Text:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'daily_kwh\' ); ?>" name="<?php echo $this->get_field_name( \'daily_kwh\' ); ?>" value="<?php echo $instance[\'daily_kwh\']; ?>" style="width:100%;" />
        </p>        

        <p>
            <label for="<?php echo $this->get_field_id( \'cost_label\' ); ?>"><?php _e(\'Cost Text:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'cost_label\' ); ?>" name="<?php echo $this->get_field_name( \'cost_label\' ); ?>" value="<?php echo $instance[\'cost_label\']; ?>" style="width:100%;" />
        </p>    

        <p>
            <label for="<?php echo $this->get_field_id( \'contact_text\' ); ?>"><?php _e(\'Contact Text:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'contact_text\' ); ?>" name="<?php echo $this->get_field_name( \'contact_text\' ); ?>" value="<?php echo $instance[\'contact_text\']; ?>" style="width:100%;" />
        </p>    

        <p>
            <label for="<?php echo $this->get_field_id( \'provide_label\' ); ?>"><?php _e(\'Provide Text:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'provide_label\' ); ?>" name="<?php echo $this->get_field_name( \'provide_label\' ); ?>" value="<?php echo $instance[\'provide_label\']; ?>" style="width:100%;" />
        </p>        

    <?php
    }
}

?>