JS实现HTML动态渐变纯色背景+CSS动态渐变字

<style>
    #ishanColor {
        animation: change 10s infinite;
    }

    @keyframes change {
        0% {
            color: #66e616;
        }

        25% {
            color: #556bd8;
        }

        50% {
            color: #e40707;
        }

        75% {
            color: #5cb85c;
        }

        100% {
            color: #e7e97d;
        }
    }
</style>

<script>
    $(function () {
        var sec = 5;
        var sz = new Array('rgba(255,20,147,0.6)',
            'rgba(152,251,152,0.6)',
            'rgba(135,206,250)',
            'rgba(0,255,255,0.6)',
            'rgba(255,165,0,0.6)',
            'rgba(186,85,211,0.6)');
        timestar = setInterval(function () {
            if (sec >= 0) {
                document.body.style.background = sz[sec];
                sec--;
            }
            else {
                sec = 5;
            }
        }, 1000);
    })
</script>

body{
color: black
background:white;
transition: 3s;
}