响应式js设置

<script>
    (function anonymous() {
        //    声明一个函数，并直接的执行
        function computed() {
            let HTML = document.documentElement, winW = HTML.clientWidth, desW = 750;
            if (winW > desW) {
                HTML.style.fontSize = "100px";
                return;
            }
            HTML.style.fontSize = winW / 750 * 100 + "px";
        }
        computed();
        window.addEventListener('resize', computed, false);
    })();
</script>