'use strict';

// backtop 开始
function initBackTop() {
    document.body.id = 'back-top';
    var backTopBtn = document.querySelector('.backtop-container');
    var backTopWrap = document.querySelector('.other-set-wrap');
    backTopBtn.href = '#back-top';

    function firstInit() {
        var scrollTop = document.documentElement.scrollTop;
        if (scrollTop > 300) {
            backTopBtn.classList.add('show');
        } else {
            backTopBtn.classList.remove('show');
        }
    }
    firstInit();

    window.addEventListener('scroll', function () {
        var scrollTop = document.documentElement.scrollTop;
        if (scrollTop > 300) {
            backTopWrap.classList.add('show');
        } else {
            backTopWrap.classList.remove('show');
        }
    });
}
window.addEventListener('load', initBackTop);
// backtop 结束
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