/**
 * [公共底部]返回页面顶部
 * @author: xuqi<qi.xu@yoho.cn>
 * @date: 2016/07/05
 */

var $ = require('yoho-jquery');

var $returnTop = $('.return-top');

function showOrNot() {
    if ($(window).height() > $(document).height()) {
        $returnTop.addClass('hide');
    }
}

$returnTop.click(function() {
    $('html,body').animate({
        scrollTop: 0
    }, 500);
});

$(window).scroll(function() {
    if ($(window).scrollTop() === 0) {
        $returnTop.addClass('hide');
    } else {
        $returnTop.removeClass('hide');
    }
});

exports.returnTopShowOrNot = showOrNot;