Question

我无法想象这一点，我希望MD数组存储一本书的名称和价格。我知道这对两个数组来说更容易，但我真的想在javascript中给出一个MD数组。我尝试了几种方法，但只能显示两次书名或书价。任何帮助将不胜感激。

var bookName = new Array();

for (var i = 0; i < 3; i++) 
{
bookName[i] = new Array();

    for (var j = 0; j < 1; j++) 
    {
        bookName[i] = prompt("Please enter book name!");
        bookName[[i][j]] = prompt("Please enter book price!");
        document.write(bookName[i] + bookName[[i][j]] + "</br>");
    }
}

Answer 1

我认为你应该只使用一个对象数组：

var books = [];
for(var i = 0; i < 3; i++) {
  books.push({
    name: prompt("Please enter book name!"),
    price: prompt("Please enter book price!")
  });
  document.write(books[i].name + books[i].price + "</br>");   
}

如果您愿意，可以改为使用数组：

var books = [];
for(var i = 0; i < 3; i++) {
  books.push([prompt("Please enter book name!"), prompt("Please enter book price!")]);
  document.write(books[i][0]+ books[i][1] + "</br>");   
}

Answer 2

以下是构建2D数组的方法：

var bookName = new Array();
for (var i = 0; i < 3; i++) 
{
    bookName[i] = new Array();
    bookName[i][0] = prompt("Please enter book name!");
    bookName[i][1] = prompt("Please enter book price!");
    document.write(bookName[i] + bookName[i][0] + ": " + bookName[i][1] + "</br>");
}

您也可以使用数组中的对象执行此操作：

var bookName = new Array();
for (var i = 0; i < 3; i++) 
{
    bookName[i] = {};
    bookName[i]["name"] = prompt("Please enter book name!");
    bookName[i]["price"] = prompt("Please enter book price!");
    document.write(bookName[i] + bookName[i].name + ": " + bookName[i].price + "</br>");
}

Answer 3

你覆盖你的bookName [i]

bookName[i] = new Array();和bookName[i] = prompt("Please enter book name!");

试试这个：

var bookName = new Array();
for (var i = 0; i < 3; i++)  {
    bookName[i] = new Array();
    for (var j = 0; j < 1; j++)  {
        var name = prompt("Please enter book name!");
        var price = prompt("Please enter book price!");
        bookName[i][j] = {name:name, price:price}
        document.write(bookName[i][j].name + bookName[i][j].price + "</br>");
    }
}

Answer 4

而不是：

bookName[i] = prompt("Please enter book name!");
bookName[[i][j]] = prompt("Please enter book price!");
document.write(bookName[i] + bookName[[i][j]] + "</br>");

这样做：

bookName[i][j][0] = prompt("Please enter book name!");
bookName[i][j][1] = prompt("Please enter book price!");
document.write(bookName[i][j][0] + bookName[i][j][1] + "</br>");

我认为我以前从未见过var [[i] [j]]格式......

Answer 5

多维数组在这里没有多大意义，你可能想要一个对象数组。

var books = [], i = 3;

while( i-- ) {
    books.push({
        name: prompt("Please enter book name!"),
        price: prompt("Please enter book price!")
    });
}

Answer 6

我不确定你在那里做什么。请熟悉JavaScript中的数组，对象和属性访问的概念。

var bookName = new Array（）;

for (var i = 0; i < 3; i++) 
{
bookName[i] = new Array();
// the i. item of bookname holds an empty array now

    for (var j = 0; j < 1; j++) 
    {
        bookName[i] = prompt("Please enter book name!");
// you're overwriting the array just created with a string now
        bookName[[i][j]] = prompt("Please enter book price!");
// this is absolutely invalid syntax
        document.write(bookName[i] + bookName[[i][j]] + "</br>");
// as well as this
    }
}

你想做什么：

var bookName = new Array();
for (var i = 0; i < 3; i++) {
    bookName[i] = new Array();
    for (var j = 0; j < 1; j++) {
        // this is absolute ugly in a for loop:
        if (j==0)
            bookName[i][j] = prompt("Please enter book name!");
        else if (j==1)
            bookName[i][j] = prompt("Please enter book price!");
    }
    // direct accessing is better:
    document.write(bookName[i][0] + bookName[i][1] + "</br>");
}

但是这样会容易得多：

var bookName = [];
for (var i = 0; i < 3; i++) {
    bookName[i] = {
        name: prompt("Please enter book name!"),
        price: prompt("Please enter book price!")
    };
    document.write(bookName[i].name + bookName[i].price + "</br>");
}

Answer 7

var bookName = [];

for (var i = 0; i < 3; i++)

{
  var b = bookName[i];
  b = [];
  for (var j = 0; j < 1; j++) 
  {
    bookName[i] = prompt("Please enter book name!");
    b[j] = prompt("Please enter book price!");
    document.write(bookName[i] + b[j] + "</br>");
  }
}

应该这样做..

Javascript多维数组问题

7 个答案: