javascript - 如何将数字转换为字符串并将它们放入 JavaScript 中的数组中？

Question

我正在用数组方法解决一个练习；我应该输入一个数字，返回值应该是相同的数字，每两个连续的偶数之间有破折号。

到目前为止，我已经编写了这段代码，但它返回一个空数组，如果您能指出我的错误，那会比提供替代解决方案要好得多。

function dashit(num){ 
   //test num = 025468, expected arr = ["0","-","2","5","4","-","6","-  ","8"]
    var arr = [];
    var prog = num.toString().split(""); // I suppose ["0","2","5","4","6","8"]
    for (var i = 0; i<num.length; i = i + 2){
        if (num[i] % 2 == 0 ){ // case of "0" and "2"
            if (num[i+1] % 2 == 0){
                arr.push(prog[i]); // "0" pushed from prog to arr
                arr.push("-");     // "-" pushed from prog to arr
                arr.push(prog[i+1]); // "2" pushed from prog to arr
            }
        }
        else { // case of "5" and "4"
                arr.push(prog[i]);  // "5" pushed from prog to arr
                arr.push(prog[i+1]); // "4" pushed from prog to arr
        }
    }
    return arr;
} 

Answer 1

你正在比较你的 num 变量，你必须比较 prog 变量:

    function dashit(num){ 
    var prog = num.toString().split(""); // I suppose ["0","2","5","4","6","8"]
    for (var i = 0; i<prog.length; i = i + 2){
        if (prog[i] % 2 == 0 ){ // case of "0" and "2"
            if (prog[i+1] % 2 == 0){
}