如何在不使用对象和 switch 语句的情况下使这个 javascript 更雄辩？

Question

我不想输入所有可能的价格组合，但我已经搜索了很长时间，但找不到更好的方法：

var selection = new Array (4);
selection[0] = new Array ('$210' 'etc', 'etc', 'etc', 'etc');
selection[1] = new Array ('Solar', 'Supernova', 'Quasar', 'Galaxy', 'Blackhole');
selection[2] = new Array ('Talk', 'Talk & Text', 'Talk, Text & Data');
selection[3] = new Array ('One Year', 'One', 'Two Years', 'Two', 'Three Years', 'Three', 'Four Years', 'Four');



function selectPhone () {

    var yourPhone = prompt("What kind of Smartphone would you like: Solar: $100, Supernova: $200, Quasar: $300, Galaxy: $400, Blackhole: $500?");

    if (yourPhone == selection[1][0]) {
        console.log("You picked: " + yourPhone + "."), selectPlan ();
    } else {
        console.log("Error.");
    }
}



function selectPlan () {

    var yourPlan = prompt("What Plan Would You Like: Talk: $10, Talk & Text: $20 or Talk, Text & Data: $30?");

    if (yourPlan == selection[2][0]) {
        console.log("You picked: " + yourPlan + "."), selectTerm ();
    } else {
        console.log("Error.");
    }
}



function selectTerm () {

    var yourTerm = prompt("What Term Would You Like: One Year: $100, Two Years: $200, Three Years: $300 or Four Years: $400?");

    if (yourTerm == selection[3][0] || selection [3][1]) {
        console.log("You picked: " + selection[3][0] + ". \n Your total is: " + selection[0][0]);
    } else {
        console.log("Error.");
    }
}


selectPhone ();

我不知道如何对其进行编程，因此它只能拾取所做的选择并将它们转换为数值并对其执行简单的加法。我是初学者，所以请解释一切。非常感谢！！

Answer 1

您可以在需要转换为整数的地方使用类似 parseInt() 的东西。这是文档https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt

Answer 2

你这样做：

var selection = new Array (4);
selection[0] = new Array ('$210', 'etc', 'etc', 'etc', 'etc');
selection[1] = new Array ('Solar', 'Supernova', 'Quasar', 'Galaxy', 'Blackhole');
selection[2] = new Array ('Talk', 'Talk & Text', 'Talk, Text & Data');
selection[3] = new Array ('One Year', 'One', 'Two Years', 'Two', 'Three Years', 'Three', 'Four Years', 'Four');


function selectPhone (selectionArray) {
    var yourPhone = prompt("What kind of Smartphone would you like: Solar?");
    for( s1 in selectionArray ){
        for( s2 in selectionArray[s1] ) {
            if (yourPhone == selectionArray[s1][s2] ) {
                console.log("You picked: " + yourPhone + ".");
            } else {
                console.log("Error.");
            }
        }
    }
}

selectPhone(selection);

不过，您确实需要了解对象。还要查看 JS 中的 for .. in 函数 - 文档会比我更好地解释它，但简而言之，您循环遍历父数组的属性（使用 for..in） - 基本上是通过数组列表。与使用相同的想法相比，您可以部分循​​环遍历每个数组。为了给你一个视觉表示，你的数组看起来像这样：

var selection  = [//outer array
                    [ //inner array - property of outer array (first for..in) = s1
                       '$210', //property of inner array (second for..in) = s2                          
                       'etc'
                    ], 
                    [ 'Solar', 'Supernova', 'Quasar', 'Galaxy', 'Blackhole' ], 
                    [ 'Talk', 'Talk & Text', 'Talk, Text & Data' ],
                    [ 'One Year', 'One', 'Two Years', 'Two', 'Three Years', 'Three', 'Four' ]
                ]