let level = $branches.switchCase(85, (switchCase) => {
    switchCase.add((it) => {
        return it >= 90 && it < 100
    }, () => {
        return "优秀"
    })
    switchCase.add((it) => {
        return it >= 80 && it < 90
    }, () => {
        return "好"
    })
    switchCase.add((it) => {
        return it >= 70 && it < 80
    }, () => {
        return "良"
    })
    switchCase.add((it) => {
        return it >= 60 && it < 70
    }, () => {
        return "及格"
    })
    switchCase.addDefault(() => {
        return "不及格"
    })
})
$console.log(level)