移动端h5页面不同尺寸屏幕适配兼容方法

<script>
    (function (doc, win) {
        var docEl = doc.documentElement;
        resizeEvt = \'orientationchange\' in window ? \'orientationchange\' : \'resize\';
        recalc = function () {
            var clientWidth = docEl.clientWidth;
            if (!clientWidth) return;
            docEl.style.fontSize = 50 * (clientWidth / 375) + \'px\';
        };
        if (!doc.addEventListener) return;
        win.addEventListener(resizeEvt, recalc, false);
        doc.addEventListener(\'DOMContentLoaded\', recalc, false);
    }(document,window));

</script>