javascript - 只打印偶数

问题：
创建一个程序，提示输入数字列表，以空格分隔。让程序打印出仅包含偶数的新列表。

将输入转换为（数组）。许多语言都可以使用内置函数轻松地将字符串转换为数组，该函数可以根据指定的分隔符将字符串分开。
编写自己的算法-不要依赖该语言的内置过滤器或类似的枚举功能。
使用一个名为“ filterEvenNumbers”的函数来封装其逻辑。该函数接收旧数组并返回新数组。

我对此的所有注释：

//global array
    var arr = [];

    var arr = prompt("Enter your numbers");
    // var eachNumber = arr.split(",");
    var res = arr.split("");
    console.log(arr);
    console.log(res);


    if(res = )

    // var str = "How are you doing today?";

    //push elements into array
    // arr.push(prompt("Enter in a bunch of numbers", "")); //push input to array
    // console.log(arr);

    // https://stackoverflow.com/questions/28252888/javascript-how-to-save-prompt-input-into-array
    // var arr = prompt("Enter your numbers").split(",");
    // console.log(arr);
    // var arr = [];
    // for(var i = 0; i < 10; i++)
    // arr.push(prompt("Enter a number");




    // Convert number into array in Javascript
    // https://stackoverflow.com/questions/20730360/convert-number-into-array-in-javascript
    // var numbers = "1, 2, 3";
    // var eachNumber = numbers.split(",");
    // /* now parse them or whatso ever */
    // console.log(eachNumber);




// JavaScript Array filter
// http://www.diveintojavascript.com/core-javascript-reference/the-array-object/array-filter
// The JavaScript Array filter method iterates over each value of an array passing it to a callback function.
// If the callback function returns true, the current value is then pushed into the resulting array.
// The callback function is invoked with three arguments: the value of the element, the index of...
// the element and the Array object being traversed.

// Bellow is an example of filtering odd and even numbers out of an array:
    // var arr = [1, 2, 3, 4, 5];
    // var odd = arr.filter(function(val) {
    //     return 0 != val % 2;
    // });
    // // odd = [1, 3, 5]
    // var even = arr.filter(function(val) {
    //     return 0 == val % 2;
    // });
    // even = [2, 4]
    // console.log(even);

// The Array filter method can also be used to remove empty, null or undefined elements from an array:

    // var arr = [0, null, 42, undefined, "", true, false, NaN, "", "foo bar"];
    // var filteredArr = arr.filter(function(val, num) {
    //     return !(val === "" || typeof val == "undefined" || val === null );
    // });
    // // // filteredArr = [0, 42, true, false, NaN, "foo bar"]

    // console.log(filteredArr);

最佳答案

var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
b = [];

for (var i = 0; i < a.length; ++i) {
if ((a[i] % 2) === 0) {
    b.push(a[i]);
}
}

这是一个数组的示例，该数组查找偶数并将其推入另一个数组。您可以轻松更改它，它不会将其推入另一个数组，而是打印偶数。它将帮助您解决问题

关于javascript - 只打印偶数，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45928757/