函数

Question

此函数应创建并显示带数字的数组。有一些元素缺失会阻止此数组显示，从而实现“console.log”假设：

function createArray(number) {
    var newArray = [/*10*/];

    for(var counter = 1; counter <= number; counter++) {
        newArray.push(counter);
    }
}

console.log("table with numbers up to 6 = " + createArray(6));
console.log("table with numbers up to 1 = " + createArray(1));
console.log("Testing negatives (should display an empty array) " + createArray(-6));
console.log("Testing 0 (should display an empty array) " + createArray(0));

你能分析一下并提供一些反馈吗？

Answer 1

您在功能结束时缺少return newArray;。如果没有return语句，则该函数默认返回undefined。

function createArray(number) {
    var newArray = [/*10*/];

    for(var counter = 1; counter <= number; counter++) {
        newArray.push(counter);
    }
    return newArray;
}

console.log("table with numbers up to 6 = " + createArray(6));
console.log("table with numbers up to 1 = " + createArray(1));
console.log("Testing negatives (should display an empty array) " + createArray(-6));
console.log("Testing 0 (should display an empty array) " + createArray(0));

Answer 2

嗯，你的函数没有任何问题，只是你没有返回创建的数组，只需添加：

在函数结束时

return newArray，请点击这个：

function createArray(number) {
    var newArray = [/*10*/];

    for(var counter = 1; counter <= number; counter++) {
        newArray.push(counter);
    }
     return newArray;
}