Question

嗨我想知道它是否可能将广告元素添加到数组中，并声明如下... 请检查add（）函数，我无法弄清楚如何解决这个问题。感谢

这不是必要的，但是如果你从c ++观点程序员那里得到解释，我会很感激。

// My array is this way declared
var myArray = [
    ['John', 'Doe', '1980'],
    ['Jane','Malloy','1982'],
    ['Vincent','Malloy','1972']
];

// then I want to add a new elements in it, but It seems to doesn't work
var add = function() {

    //var textbox = document.getElementById('textbox').value;

    // storing new person in array
    myArray [3][0] = 'New1';
    myArray [3][1] = 'New2';
    myArray [3][2] = 'New3';
};

//finnaly this function is for displaying the elements of myArray
var show = function() {

    // clean output
    document.getElementById('output').innerHTML = '';

    // delay time
    setTimeout (function() {

    // showing info. people
        for (var i in myArray) {
            for (var j in myArray)
                document.getElementById('output').innerHTML += myArray[i][j] + ' ';

            document.getElementById('output').innerHTML += '<br/>';
        }

    }, 250);
};

Answer 1

就在这里：

var add = function() {

    //var textbox = document.getElementById('textbox').value;

    // storing new person in array
    myArray [3][0] = 'New1';
    myArray [3][1] = 'New2';
    myArray [3][2] = 'New3';
};

您无法添加myArray[3]，因为myArray[3]未定义。您需要先将空数组分配给myArray[3]：

    myArray [3] = [];
    myArray [3][0] = 'New1';
    myArray [3][1] = 'New2';
    myArray [3][2] = 'New3';

或者更一般地说，假设想要添加到数组的末尾，您可以执行以下操作：

 var idx = myArray.length;
 myArray[idx] = [];
 myArray[idx][0] = "New 1";
 // ...

甚至可能是：

var newArray = ["New1", "New2", "New3"];
myArray.push(newArray);

Js：声明了多维数组文字：添加元素

1 个答案: