将值添加到多维数组的末尾

Question

I have an array of arrays and I want to be able to add values to the array every time a user hits the add button.

var transactions = [];
transactions[0] = []; // holds date
transactions[1] = []; // holds transaction type
transactions[2] = []; // holds amount


transactions[0][i] = $("date").value;
transactions[1][i] = $("transType").value;
transactions[2][i] = parseFloat( $("amount").value);

these are the snippets . . . I realize I need to work on validation (which I will do) at this point I'm more concerned with loading the arrays. The problem is the method I'm familiar with works with 1-dimensional arrays and I don't know how to replace it.

in short is it possible to reproduce this:

transactions[transactions.length] = $("date").value;

for a multidimensional array.

Thank You

Answer 1

使用push ：

transactions[0].push( $("date").value );

Answer 2

You're looking for the Array.push() method. It allows you to push values on to the end of an array.

For your use case, you can do that on both levels of the array. See below:

var transactions = [];
transactions.push([]);
transactions.push([]);

transactions[0].push( $('date').value );

Answer 3

There is no problem for using the same approach:

transactions[0][transactions[0].length] = $("date").value;

or with push method:

transactions[0].push($("date").value);

... keeping in mind that you've initialized transactions[0] with empty array [] .

Answer 4

是的，只是多维的同义

transactions[0][transactions[0].length] = var1;

Answer 5

Seems a little weird you are doing:

[[array of transaction dates],[array of transaction types],[array of transaction amounts]]

Are you sure you don't want

[array of transactions, with date,type,amount properties]

?

var transactions = [];
transactions.push({'date': $("date").value, 'type': $("transType").value, 'amount': parseFloat( $("amount").value)});

var i = 0;

alert('date ' + transactions[i].date + ' type ' + transactions[i].type + ' amount ' + transactions[i].amount);