网易webapp 通过js计算html的font-size

来源：互联网发布：云购cms源码编辑：程序博客网时间：2024/05/20 05:10
设计稿宽度为 750px，取一个100px的font-size为参照,设备宽度就可以设置为 7.5rem;
计算rem就可以直接除以100，如：100px = 1rem
 var Dpr = 1, uAgent = window.navigator.userAgent;        var isIOS = uAgent.match(/iphone/i);        var isYIXIN = uAgent.match(/yixin/i);        var is2345 = uAgent.match(/Mb2345/i);        var ishaosou = uAgent.match(/mso_app/i);        var isSogou = uAgent.match(/sogoumobilebrowser/ig);        var isLiebao = uAgent.match(/liebaofast/i);        var isGnbr = uAgent.match(/GNBR/i);        function resizeRoot(){            var wWidth = (screen.width > 0) ? (window.innerWidth >= screen.width || window.innerWidth == 0) ? screen.width : window.innerWidth : window.innerWidth, wDpr, wFsize;            var wHeight = (screen.height > 0) ? (window.innerHeight >= screen.height || window.innerHeight == 0) ? screen.height : window.innerHeight : window.innerHeight;            if (window.devicePixelRatio) {                wDpr = window.devicePixelRatio;            } else {                wDpr = isIOS ? wWidth > 818 ? 3 : wWidth > 480 ? 2 : 1 : 1;            }            if(isIOS) {                wWidth = screen.width;                wHeight = screen.height;            }            // if(window.orientation==90||window.orientation==-90){            //     wWidth = wHeight;            // }else if((window.orientation==180||window.orientation==0)){            // }            if(wWidth > wHeight){                wWidth = wHeight;            }            wFsize = wWidth > 1080 ? 144 : wWidth / 7.5;            wFsize = wFsize > 32 ? wFsize : 32;            window.screenWidth_ = wWidth;            if(isYIXIN || is2345 || ishaosou || isSogou || isLiebao || isGnbr){//YIXIN 和 2345 这里有个刚调用系统浏览器时候的bug，需要一点延迟来获取                setTimeout(function(){                    wWidth = (screen.width > 0) ? (window.innerWidth >= screen.width || window.innerWidth == 0) ? screen.width : window.innerWidth : window.innerWidth;                    wHeight = (screen.height > 0) ? (window.innerHeight >= screen.height || window.innerHeight == 0) ? screen.height : window.innerHeight : window.innerHeight;                    wFsize = wWidth > 1080 ? 144 : wWidth / 7.5;                    wFsize = wFsize > 32 ? wFsize : 32;                    document.getElementsByTagName('html')[0].dataset.dpr = wDpr;                    document.getElementsByTagName('html')[0].style.fontSize = wFsize + 'px';                   // document.getElementById("fixed").style.display="none";                },500);            }else{                 document.getElementsByTagName('html')[0].dataset.dpr = wDpr;                 document.getElementsByTagName('html')[0].style.fontSize = wFsize + 'px';                //document.getElementById("fixed").style.display="none";            }               //alert("fz="+wFsize+";dpr="+window.devicePixelRatio+";UA="+uAgent+";width="+wWidth+";sw="+screen.width+";wiw="+window.innerWidth+";wsw="+window.screen.width+window.screen.availWidth);        }        resizeRoot();
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