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let len = document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info').length
let id = Math.floor(Math.random() * 100000 % len) 
let name = document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info')[id].getElementsByClassName('title')[0].innerText;
window.alert('今日宜閱讀：【' + name + '】')
let bookurl = document.getElementsByClassName('books')[0].getElementsByClassName('list-group list-group-flush')[0].getElementsByClassName('library-item-info')[id].getElementsByClassName('reader-link')[0].href;
window.open(bookurl)