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我试图运行原型，对象和嵌套循环的库检入/出系统模拟。我无法正确地将伪代码集成到循环中，并希望得到任何帮助。Javascript - 循环在执行模拟时无法正常工作
//while loop or for loop for 90 days
//For loop over catalog
//forloop over patrons
//Check if available , if so check book out
//If not available check book back in
//check checking back in check to see if book is overdue and if so add a fine
//When down loop over patrons to see their fees
环
for (var i = 0; i < 90; i++) {
for (var j = 0; j < catalog.length; j++) {
for (var k = 0; k < patrons.length; i++) {
var fine = patrons[k].fine;
if (catalog[k].Available) {
catalog[k].checkOut;
} else {
catalog[k].checkIn;
patrons[k].read;
}
if (catalog[k].isOverdue) {
fine = fine + 5.00;
}
}
}
patrons[i].fine = fine;
}
所有
var Book = function(title, Available, publicationDate, checkoutDate, callNumber, Authors) {
this.title = title;
this.Available = Available;
this.publicationDate = publicationDate;
this.checkoutDate = checkoutDate;
this.callNumber = callNumber;
this.Authors = Authors;
};
var Author = function(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
};
var Patron = function(firstName, lastName, libCardNum, booksOut, fine) {
this.firstName = firstName;
this.lastName = lastName;
this.libCardNum = libCardNum;
this.booksOut = booksOut;
this.fine = fine;
};
Book.prototype.checkOut = function() {
this.Available = false;
var temp = new Date(1000000000);
var date = new Date() - temp;
var res = new Date(date);
this.checkoutDate = res;
};
Book.prototype.checkIn = function() {
this.Available = true;
};
Book.prototype.isOverdue = function() {
var singleDay = 1000 * 60 * 60 * 24;
var todayDate = new Date().getTime();
var difference = todayDate - this.checkoutDate.getTime();
if (Math.round(difference/singleDay) >= 14) {
return true;
}
return false;
};
Patron.prototype.read = function(book) {
this.booksOut.add(book);
}
Patron.prototype.return = function(book) {
this.booksOut.remove(this.booksOut.length);
}
var authors = [];
authors[0] = new Author("Auth", "One");
authors[1] = new Author("AutL", "Two");
var catalog = [];
catalog[0] = new Book('Bk1', true, new Date(2001, 1, 21), new Date(), 123456, authors);
catalog[1] = new Book('Bk2', true, new Date(2002, 2, 22), new Date(), 987656, authors);
catalog[2] = new Book('Bk3', true, new Date(2003, 3, 23), new Date(), 092673, authors);
catalog[3] = new Book('Bk4', true, new Date(2004, 4, 24), new Date(), 658342, authors);
catalog[4] = new Book('Bk5', true, new Date(2005, 5, 25), new Date(), 345678, authors);
var patrons = [];
patrons[0] = new Patron('Pat1', 'Wat', 1, catalog, 0.00);
patrons[1] = new Patron('Pat2', 'Wot', 1, catalog, 0.00);
patrons[2] = new Patron('Pat3', 'Wit', 1, catalog, 0.00);
patrons[3] = new Patron('Pat4', 'Wet', 1, catalog, 0.00);
patrons[4] = new Patron('Pat5', 'Wut', 1, catalog, 0.00);
//while loop or for loop for 90 days
//For loop over catalog
//forloop over patrons
//Check if available , if so check book out
//If not available check book back in
//check checking back in check to see if book is overdue and if so add a fine
//When down loop over patrons to see their fees
for (var i = 0; i < 90; i++) {
for (var j = 0; j < catalog.length; j++) {
for (var k = 0; k < patrons.length; i++) {
var fine = patrons[k].fine;
if (catalog[k].Available) {
catalog[k].checkOut;
} else {
catalog[k].checkIn;
patrons[k].read;
}
if (catalog[k].isOverdue) {
fine = fine + 5.00;
}
}
}
patrons[i].fine = fine;
}
for (i = 0; i < patrons.length; i++) {
console.log(patrons[i].firstName + " has checked out the following books:");
for (j = 0; j < patrons[i].booksOut.length; j++) {
console.log(patrons[i].booksOut[j].title);
}
console.log(patrons[i].firstName + " has fine amount: $" + patrons[i].fine);
}
我试图写一个循环，模拟检出，并且签入的3个月内的代码。我每天迭代目录，以及顾客数组中的每个人。如果该顾客目前已经将该书签出，那么我将它签入。如果它未被签出，那么我通过顾客阅读方法将其添加到顾客列表中。如果这本书已经逾期，那么我会向返还它的顾客追加5美元的罚款。在3个月期间结束时，我必须展示每位赞助人，他们目前已经签出的书籍以及他们可能拥有的任何罚款。
您是否知道您正在使用你在初始化循环之外的'k'？ –
@MikeC对不起，这是一个拼写错误，我只是测试，并忘记回到它为每循环。尽管如此，问题仍然存在。 –
行'patrons [i] .fine = fine;'可能会产生错误，因为您正在使用运行90次循环的迭代器引用您的赞助人数组（例如长度为5）。可能会产生超出范围错误的索引。 – Ken