// 记录当天已阅读章数
function saveChapterNum(){
    var today = new Date(new Date().toLocaleDateString()).getTime();
    var readedChapterNum = localStorage.getItem('readedChapterNum');
    var readedChapterObj = readedChapterNum ? JSON.parse(readedChapterNum) : null;
    var lastSaveTime,num;
    if(readedChapterObj){
        lastSaveTime = readedChapterObj.lastSaveTime;
        num = readedChapterObj.num;
        if(today > lastSaveTime){
            // 新的一天，章节数归零
            num = 0;
        }
        lastSaveTime = new Date().getTime();
        num += 1;
    }else{
        lastSaveTime = new Date().getTime();
        num = 1;
    }
    localStorage.setItem('readedChapterNum',JSON.stringify({num:num,lastSaveTime:lastSaveTime}));

}
saveChapterNum();