switch语句中的大于和小于

Question

我在试着找出为什么这个代码不能工作

let userName = 'roy';
const userQuestion = 'Do you do CrossFit?';
userName ? console.log('Hello ' + userName + ' !') : console.log('Hello!');
console.log(`The user asked: ${userQuestion}`);
let randomNumber = Math.floor(Math.random() * 8);
let eightBall = '';
console.log(randomNumber);

switch (randomNumber) {
    case 0:
        eightBall = 'It is certain';
        break;
    case 1:
        eightBall = 'It is defidedly so';
        break;
    case randomNumber >= 1:
        eightBall = 'we cant tell';
        break;
}

console.log(` The eight ball answered: ${eightBall}`);

试图在数字大于1时生成“我们可以判断”，但没有打印任何内容。我是否使用了错误的switch语句？

Answer 1

在if语句中使用默认值，如下所示：

​

let randomNumber = 100
let eightBall = ''

switch (randomNumber) {
    case 0:
        eightBall = 'It is certain';
        break;
    case 1:
        eightBall = 'It is defidedly so';
        break;
    default:
        if(randomNumber >= 1)
            eightBall = 'we cant tell';
        break;
}

console.log(` The eight ball answered: ${eightBall}`);

​

Answer 2

case也接受一个相等的参数，而不是一个布尔表达式。您可以只使用default分支：

switch (randomNumber) {
    case 0:
        eightBall = 'It is certain';
        break;
    case 1:
        eightBall = 'It is defidedly so';
        break;
    default: // Here!
        eightBall = 'we cant tell';
        break;
}