javascript - javascript中切换的多种条件

Question

如何在JS中为switch语句设置多个条件？

或者如何设置或调节开关内部？

例如:

switch(apple.amount) or switch(orange.amount)
{

case '1 kg':
total = 100;
break;

case '2 kg':
 total = 200;
break;
}

Answer 1

使用循环:

var amounts = [apple.amount, orange.amount];
var totals = [];
for(var i = 0; i < amounts.length; i++){
    switch(amounts[i])
    {
        case '1 kg':
        totals[i] = 100;
        break;

        case '2 kg':
        totals[i] = 200;
        break;
    }
}

如果您确定在任何执行过程中只有一个具有值，您可以使用 || 运算符:

var amount1;
var amount2 = '2 kg';
var total;

    switch(amount1 || amount2 )
    {
        case '1 kg':
        total = 100;
        break;

        case '2 kg':
        total = 200;
        break;
    }

alert(total);