基于 贡献一个linux.do帖子内随机抽（跳转）楼层的js代码段，可用于抽奖 - 软件分享 - LINUX DO 进行修改
async function fetchChoujiang() {
// 使用URL对象处理当前URL
const currentUrl = new URL(window.location.href);
// 检查当前URL是否以.json结尾，如果不是，则添加.json扩展名
const jsonUrl = currentUrl.pathname.endsWith('.json') ? currentUrl.href : currentUrl.href + '.json';
// 使用fetch获取JSON数据
const response = await fetch(jsonUrl);
const data = await response.json();
if (data && data.post_stream && data.post_stream.stream) {
const postId = window.location.href.match('t/topic/(\\d+)')[1];
const postIdToFloor = new Map(data.post_stream.stream.map((id, idx)=>[id,idx]));
const userIdToFloor = new Map();
const postIds = data.post_stream.stream.slice(1);
const batchSize = 20;
for(let i = 0; i < postIds.length; i+=batchSize){
const batch = postIds.slice(i, i+batchSize);
console.log('fetching', batch)
const postsUrl = '/t/' + postId +'/posts.json?'
const param = new URLSearchParams();
param.append('include_suggested', false);
batch.forEach(id=>param.append('post_ids[]',id));
const postsResponse = await fetch(postsUrl + param)
const postsData = await postsResponse.json()
for (const post of postsData.post_stream.posts) {
const floor = postIdToFloor[post.id];
userIdToFloor.set(post.user_id, floor)
}
}
// 生成随机数
const random_floor = Math.floor(Math.random() * userIdToFloor.size + 1)
console.log('抽中了',random_floor);
// 更新URL的最后一部分
const list1 = currentUrl.pathname.split("/");
if(list1[list1.length - 2]=="topic"){list1.push(random_floor);};
if(list1[list1.length - 3]=="topic"){list1[list1.length - 1] = random_floor;};
// 生成新的URL
const newUrl = list1.join("/");
// 导航到新的URL
window.location.assign(newUrl);
}
};
await fetchChoujiang();
