获取到的值为undefined报错解决办法

[Secd0g]

如果豆瓣有些出版年或者出版社等信息没有的话就会出现undefined错误，导致不能同步到notion当中，可以将getBookInfo的函数修改一下即可

function getBookInfo(){
    let infos = document.getElementById("info").getElementsByClassName("pl");
    var book = {};
    book["title"] = document.getElementsByTagName("h1")[0].getElementsByTagName("span")[0].innerText;
    book["封面"] = document.getElementsByClassName("nbg")[0].href;
    book["评分"] = document.getElementsByClassName("rating_num")[0].innerText;
    for(let info of infos) {
        if(info.innerText === "作者") {
            book["作者"] = info.nextSibling.nextSibling.innerText
        }
        else if(info.innerText === "出版社:") {
            if(info.nextSibling.nextSibling.innerText == ""){
                book["出版社"] =info.nextSibling.textContent
            }else{
                book["出版社"] = info.nextSibling.nextSibling.innerText
            }
             
        }
        else {
            prop = info.innerText.substr(0,info.innerText.length-1)
            book[prop] = info.nextSibling.data
        }  
    }
    var preInfos = ["作者","评分","出版社","出版年","页数","ISBN"]
    for(let info of preInfos){
        if(book[info]==undefined){
            book[info]=""
        }
    }

    return book
}