纯文字版返回顶端的js代码

代码如下:[removed]var goto_top_type = -1;var goto_top_itv = 0;function goto_top_timer() { var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop; var moveby = 15; y -= Math.ceil(y * moveby / 100); if (y < 0) { y = 0; } if (goto_top_type == 1) {