function test() {
    var index = 0;
    while (1) {
        switch (index) {
            case 0:
                console.log('this is case-block 0');
                index = 3
                continue
            case 1:
                console.log('this is case-block 1');
                return;
                index = 5
                continue
            case 2:
                console.log('this is case-block 2');
                index = 1
                continue
            case 3:
                console.log('this is case-block 3');
                index = 4
                continue
            case 4:
                console.log('this is case-block 4');
                index = 2
                continue
        }
    }
}

test()