js数组的includes方法优化判断逻辑

js数组的includes方法代替大量判断

// 优化前
// function printAnimals(animal) {
//     if (animal === 'dog'|| animal === 'cat'){
//         console.log(`I have a ${animal}`)
//     }
// }
// printAnimals('dog')

//优化后
function printAnimals(animal) {
    // 后续判断条件已维护、便于新增与修改
    const animals = ['dog','cat','hamster']
    if (animal.includes(animal)){
        console.log(`I have a ${animal}`)
    }
}
printAnimals('dog') // I have a dog