Snapaper | 一个「伪」刷题网站的诞生

<?php
 $filename = $_GET['filename'];
 header('content-disposition:attachment;filename='.basename($filename));
 header('content-length:'. filesize($filename));
 readfile($filename);
?>

function download_list(){ //列表下载
 var urls = $('#download_items').val(); //获取列表数据
 if(urls == ''){ //为空则提示
 alert('Can not download empty list');
 }else{
 $('#count_list_notice')[0].style.display = 'none';
 toTop();
 $('#dl')[0].innerHTML = '<button class="uk-button uk-button-danger" style="border-radius: 5px;margin-left: 0.5%;">Processing...</button><button class="uk-button uk-button-default" style="border-radius: 5px;margin-left: 0.5%;" onclick="location.reload();">Refresh</button>'; //修改按钮
 $('#notice')[0].style.display = 'unset'; //显示提示
 var url = urls.split(','); //半角逗号分隔字符串为数组
 var idname = ''; //初始化idname
 var num = 0; //初始化指针值
 var click = function(){
 if(num == (url.length)){ //指针到达列表总数
 window.clearInterval(interval); //清除interval
 }else{
 idname = '#' + url[num]; //补全idname
 downloadFile($(idname).attr('href'));
 num += 1; //累加指针
 }
 }
 window.interval = setInterval(click,3000); //设置interval
 }
}
 function remove_items(id){ //删除列表指定id 值
 var current = $('#download_items').val(); //获取当前列表值
 var current = current.split(','); //分隔列表字符串为数组
 current.splice($.inArray(id,current),1); //获取删除值位置并删除
 var now_count = current.length;
 if(now_count == 0){
 $('#count_list_notice')[0].style.display = 'none';
 }else{
 $('#list_count')[0].innerHTML = now_count;
 }
 var now = current.join(","); //数组转换回字符串
 $('#download_items').val(now); //存入列表值
 var change = '#btn'+id; //补全提示已修改的按钮id
 $(change).attr('onclick', 'add_items('+ id +')'); //修改按钮onclick
 $(change)[0].innerHTML = 'Add to List'; //修改按钮文本
 $(change)[0].className = 'papers-list-td-btn1'; //修改按钮css
 console.log($('#download_items').val()); //方便debug
}
 function add_items(id){ //增加列表值
 var current = $('#download_items').val(); //获取当前列表值
 if(current == ''){ //若当前列表值为空
 var now = id;
 var change = '#btn'+id;
 $('#download_items').val(now); //直接赋值给列表，不增加连接符
 $(change).attr('onclick', 'remove_items('+ id +')');
 $(change)[0].innerHTML = 'Remove from List';
 $(change)[0].className = 'papers-list-td-btn1-change';
 $('#count_list_notice')[0].style.display = 'unset';
 $('#list_count')[0].innerHTML = '1';
 }else{
 var now = current + ',' + id //否则增加连接符
 var change = '#btn'+id;
 $('#download_items').val(now);
 $(change).attr('onclick', 'remove_items('+ id +')');
 $(change)[0].innerHTML = 'Remove from List';
 $(change)[0].className = 'papers-list-td-btn1-change';
 now = current.split(",");
 var now_count = now.length + 1;
 $('#list_count')[0].innerHTML = now_count;
 }
 console.log($('#download_items').val());
}
function down(id){
 var id = '#'+id;
 $(id)[0].click();
}
/* UX 功能 */
function toTop(){
 var gotoTop= function(){
 var currentPosition = document.documentElement.scrollTop || document.body.scrollTop;
 currentPosition -= 50;
 if (currentPosition > 0) {
 window.scrollTo(0, currentPosition);
 }
 else {
 window.scrollTo(0, 0);
 clearInterval(timer);
 timer = null;
 }
 }
 var timer=setInterval(gotoTop,0.3);
}
function toBottom(){
 $('#bottom')[0].scrollIntoView();
}
/* 随浏览器变化而改变 */
function getScrollTop() {　　
 return scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
}
window.onscroll = function () {
 if (getScrollTop() <= 400) {
 $('#to_top')[0].style.display = 'none';
 $('#to_bottom')[0].style.display = 'none';
 $('#sticky')[0].style.display = 'none';
 }else {
 $('#to_top')[0].style.display = 'unset';
 $('#to_bottom')[0].style.display = 'unset';
 $('#sticky')[0].style.display = 'unset';
 }
}
/* 结束随浏览器变化而改变 */
/* 结束 UX 功能 */