移动端布局

 1.css

@charset "UTF-8";
html {
	font-family:  "微软雅黑", Tahoma, Helvetica, Arial, sans-serif;
	font-size: calc(100vw/7.2);
	font-size: -webkit-calc(100vw/7.2);
	-webkit-text-size-adjust: 100%;
	margin: 0 auto;
	max-width: 720px;
	min-width: 320px;

}
@media only screen and (min-width: 720px) {
	html{
		font-size: 100px;
	}
}
*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	-webkit-box-sizing: border-box;
}
body {
	width: 100%;
	height: 100%;
	line-height: normal;    		
	-webkit-overflow-scrolling: touch;
	/*最小设为12px*/
	font-size:12px;
}

2.rem

;(function(designWidth, maxWidth) {
    var doc = document,
        win = window;
    var docEl = doc.documentElement;
    var tid;
    var rootItem,rootStyle;

    function refreshRem() {
        var width = docEl.getBoundingClientRect().width;
        if (!maxWidth) {
            maxWidth = 540;
        };
        if (width > maxWidth) {
            width = maxWidth;
        }
        //与淘宝做法不同，直接采用简单的rem换算方法1rem=100px
        var rem = width * 100 / designWidth;
        //兼容UC开始
        rootStyle="html{font-size:"+rem+'px !important}';
        rootItem = document.getElementById('rootsize') || document.createElement("style");
        if(!document.getElementById('rootsize')){
            document.getElementsByTagName("head")[0].appendChild(rootItem);
            rootItem.id='rootsize';
        }
        if(rootItem.styleSheet){
            rootItem.styleSheet.disabled||(rootItem.styleSheet.cssText=rootStyle)
        }else{
            try{rootItem.innerHTML=rootStyle}catch(f){rootItem.innerText=rootStyle}
        }
        //兼容UC结束
        docEl.style.fontSize = rem + "px";
    };
    refreshRem();

    win.addEventListener("resize", function() {
        clearTimeout(tid); //防止执行两次
        tid = setTimeout(refreshRem, 300);
    }, false);

    win.addEventListener("pageshow", function(e) {
        if (e.persisted) { // 浏览器后退的时候重新计算
            clearTimeout(tid);
            tid = setTimeout(refreshRem, 300);
        }
    }, false);

    if (doc.readyState === "complete") {
        doc.body.style.fontSize = "12px";
    } else {
        doc.addEventListener("DOMContentLoaded", function(e) {
            doc.body.style.fontSize = "12px";
        }, false);
    }
})(750,750);