题解 | #双色球机选一注#

randomFn();

function randomFn() {
    let redBalls = document.querySelectorAll('.red .balls-wp b'),
        blueBalls = document.querySelectorAll('.blue .balls-wp b');
    let redParent = document.querySelector('.red .balls-wp'),
        blueParent = document.querySelector('.blue .balls-wp');
    let redRandoms = [];
    let redRandomBalls = [];
    while(redRandoms.length < 6){
        let random = Math.floor(Math.random() * 33);
        if(!redRandoms.includes(random)){
            redRandoms.push(random);
            let redBall = redBalls[random];
            redBall.className = 'active';
            redRandomBalls.push(redBall);
        }
    }
    let blueBall = blueBalls[Math.floor(Math.random() * 16)];
    blueBall.className = 'active';
    redRandomBalls = redRandomBalls.sort((a,b) => b.innerHTML - a.innerHTML);
    for(let i = 0; i < 6; i++){
        redBalls = document.querySelectorAll('.red .balls-wp b');
        redParent.insertBefore(redRandomBalls[i],redBalls[0]);
    }
    blueParent.insertBefore(blueBall,blueBalls[0]);
    
    return redRandomBalls.map(ball => ball.innerHTML).reverse().join(',') + '|' + blueBall.innerHTML;
}