详解html5页面 rem 布局适配方法

!(function(win, doc){  function setFontSize() {    // 获取window 宽度    // zepto实现 $(window).width()就是这么干的    var winWidth =  window.innerWidth;    // doc.documentElement.style.fontSize = (winWidth / 640) * 100 + 'px' ;        // 640宽度以上进行限制 需要css进行配合    var size = (winWidth / 640) * 100;    doc.documentElement.style.fontSize = (size < 100 ? size : 100) + 'px' ;  }  var evt = 'onorientationchange' in win ? 'orientationchange' : 'resize';  var timer = null;  win.addEventListener(evt, function () {    clearTimeout(timer);    timer = setTimeout(setFontSize, 300);  }, false);  win.addEventListener("pageshow", function(e) {    if (e.persisted) {      clearTimeout(timer);      timer = setTimeout(setFontSize, 300);    }  }, false);  // 初始化  setFontSize();}(window, document));

(function(WIN) {    var  setFontSize = WIN.setFontSize = function (_width) {        var  docEl = document.documentElement;         // 获取当前窗口的宽度        var  width = _width || docEl.clientWidth; // docEl.getBoundingClientRect().width;        // 大于 1080px 按 1080        if (width > 1080) {             width = 1080;        }        var  rem = width / 10;        console.log(rem);        docEl.style.fontSize = rem + 'px';        // 误差、兼容性处理        var  actualSize = win.getComputedStyle && parseFloat(win.getComputedStyle(docEl)["font-size"]);        if (actualSize !== rem && actualSize > 0 && Math.abs(actualSize - rem) > 1) {            var remScaled = rem * rem / actualSize;            docEl.style.fontSize = remScaled + 'px';        }    }    var timer;    function dbcRefresh() {        clearTimeout(timer);        timer = setTimeout(setFontSize, 100);    }    //窗口更新动态改变 font-size    WIN.addEventListener('resize', dbcRefresh, false);    //页面显示时计算一次    WIN.addEventListener('pageshow', function(e) {        if (e.persisted) {             dbcRefresh()         }    }, false);    setFontSize();})(window)//对H5活动推过页面，宽高比例有所要求，可适当调整function adjustWarp(warpId = '#warp') {    const $win = $(window);    const height = $win.height();    let width = $win.width();    // 考虑导航栏情况    if (width / height < 360 / 600) {        return;    }    width = Math.ceil(height * 360 / 640);    $(warpId).css({        height,        width,        postion: 'relative',        top: 0,        left: 'auto',        margin: '0 auto'    });    // 重新计算 rem    window.setFontSize(width);}

@media screen and ( min-width: 320px){html{font-size:50px}}@media screen and ( min-width: 360px){html{font-size:56.25px}}@media screen and ( min-width: 375px){html{font-size:58.59375px}}@media screen and ( min-width: 384px){html{font-size:60px}}@media screen and ( min-width: 400px){html{font-size:62.5px}}@media screen and ( min-width: 414px){html{font-size:64.6875px}}@media screen and ( min-width: 424px){html{font-size:66.25px}}@media screen and ( min-width: 480px){html{font-size:75px}}@media screen and ( min-width: 540px){html{font-size:84.375px}}@media screen and ( min-width: 640px){html{font-size:100px}}