// 非简写
        let x = ‘a‘
        if (x === ‘a‘ || x === ‘b‘ || x === ‘c‘ || x === ‘d‘) {
            console.log(11111);
        }

        // 简写
        let arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘]
        if (arr.includes(x)) {
            console.log(11111);
        }

js多条件判断的简写