js页面百分比缩放

<script>
    var docEl = document.documentElement,
            resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
    var clientWidth = docEl.clientWidth;
    docEl.style.fontSize = 10 * (clientWidth / 320) + 'px';
    window.addEventListener(resizeEvt, function() { clientWidth = docEl.clientWidth;docEl.style.fontSize = 10 * (clientWidth / 320) + 'px'; }, false);
</script>