jQuery.fn.rater = function(options) {

    // 默认参数
    var settings = {
   
        enabled: true,
        url: '',
        method: 'post',
        min: 1,
        max: 3,
        step: 1,
        value: null,
        after_click: null,
        before_ajax: null,
        after_ajax: null,
        image: 'http://www.yi9.com/images/star.gif',
        width: 25,
        height: 25
    };

    // 自定义参数
    if (options) {
        jQuery.extend(settings, options);
    }

    // 主容器
    var content = jQuery('<ul class="rater-star"></ul>');
    content.css('background-image', 'url(' + settings.image + ')');
    content.css('height', settings.height);
    content.css('width', (settings.width * settings.step) * (settings.max - settings.min + settings.step) / settings.step);

    // 当前选中的
    var item = jQuery('<li class="rater-star-item-current"></li>');
    item.css('background-image', 'url(' + settings.image + ')');
    item.css('height', settings.height);
    item.css('width', 0);
    item.css('z-index', settings.max / settings.step + 1);
    if (settings.value) {
        item.css('width', ((settings.value - settings.min) / settings.step + 1) * settings.step * settings.width);
    }

    content.append(item);

    // 星星
    for (var value = settings.min; value <= settings.max; value += settings.step) {
        item = jQuery('<li class="rater-star-item"></li>');

        item.attr('title', value);
        item.css('height', settings.height);
        item.css('width', (value - settings.min + settings.step) * settings.width);
        item.css('z-index', (settings.max - value) / settings.step + 1);
        item.css('background-image', 'url(' + settings.image + ')');

        if (!settings.enabled) {	// 若是不能更改，则隐藏
            item.hide();
        }

        content.append(item);
    }

    content.mouseover(function() {
        if (settings.enabled) {
            jQuery(this).find('.rater-star-item-current').hide();
        }
    }).mouseout(function() {
        jQuery(this).find('.rater-star-item-current').show();
    })

    // 添加鼠标悬停/点击事件
    content.find('.rater-star-item').mouseover(function() {
        jQuery(this).attr('class', 'rater-star-item-hover');
    }).mouseout(function() {
        jQuery(this).attr('class', 'rater-star-item');
    }).click(function() {
        jQuery(this).prevAll('.rater-star-item-current').css('width', jQuery(this).width());

        var star_count = (settings.max - settings.min) + settings.step;
        var current_number = jQuery(this).prevAll('.rater-star-item').size() + 1;
        var current_value = settings.min + (current_number - 1) * settings.step;
        var data = {
            value: current_value,
            number: current_number,
            count: star_count,
            min: settings.min,
            max: settings.max
        }

        // 处理回调事件
        if (typeof settings.after_click == 'function') {
            settings.after_click(data);
        }

        // 处理ajax调用
        if (settings.url) {

            jQuery.ajax({
                data: data,
                type: settings.method,
                url: settings.url,
                beforeSend: function() {
                    if (typeof settings.before_ajax == 'function') {
                        settings.before_ajax(data);
                    }
                },
                success: function(ret) {
                    if (typeof settings.after_ajax == 'function') {
                        data.ajax = ret;
                        settings.after_ajax(data);
                    }
                }
            });

        }
    })

    jQuery(this).html(content);

}