移动和PC的适配

        <script>
            //mode  移动端的适配方式 按需 传参  目前只有两种 px和rem
            (function(win, doc, mode) {
                var std = 750;
                if(/(iPhone|iPad|iPod|iOS|Android|Windows Phone|BlackBerry|SymbianOS)/i.test(navigator.userAgent)) {
                    var h = document.getElementsByTagName("head")[0];
                    h.insertAdjacentHTML('beforeEnd', '<meta name="apple-mobile-web-app-capable" content="yes">');
                    h.insertAdjacentHTML('beforeEnd', '<meta name="apple-mobile-web-app-status-bar-style" content="black">');
                    h.insertAdjacentHTML('beforeEnd', '<meta name="format-detection" content="telephone=no">');
                    h.insertAdjacentHTML('beforeEnd', '<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no,minimal-ui" />');
                    if(mode == 'px') {
                        //    Px移动端速配
                        if (!win.addEventListener) return;
                        var html=document.documentElement;
                        function setFont()
                        {
                            function adaptVP(a){function c(){var c,d;return b.uWidth=a.uWidth?a.uWidth:750,b.dWidth=a.dWidth?a.dWidth:window.screen.width||window.screen.availWidth,b.ratio=window.devicePixelRatio?window.devicePixelRatio:1,b.userAgent=navigator.userAgent,b.bConsole=a.bConsole?a.bConsole:!1,a.mode?(b.mode=a.mode,void 0):(c=b.userAgent.match(/Android/i),c&&(b.mode="android-2.2",d=b.userAgent.match(/Android\s(\d+.\d+)/i),d&&(d=parseFloat(d[1])),2.2==d||2.3==d?b.mode="android-2.2":4.4>d?b.mode="android-dpi":d>=4.4&&(b.mode=b.dWidth>b.uWidth?"android-dpi":"android-scale")),void 0)}function d(){var e,f,g,h,c="",d=!1;switch(b.mode){case"apple":f=(window.screen.availWidth*b.ratio/b.uWidth)/b.ratio;c="width="+b.uWidth+",initial-scale="+f+",minimum-scale="+f+",maximum-scale="+f+",user-scalable=no";break;case"android-2.2":a.dWidth||(b.dWidth=2==b.ratio?720:1.5==b.ratio?480:1==b.ratio?375:.75==b.ratio?240:480),e=window.screen.width||window.screen.availWidth,375==e?b.dWidth=b.ratio*e:750>e&&(b.dWidth=e),b.mode="android-dpi",d=!0;case"android-dpi":f=160*b.uWidth/b.dWidth*b.ratio,c="target-densitydpi="+f+", width="+b.uWidth+", user-scalable=no",d&&(b.mode="android-2.2");break;case"android-scale":c="width="+b.uWidth+", user-scalable=no"}g=document.querySelector("meta[name='viewport']")||document.createElement("meta"),g.name="viewport",g.content=c,h=document.getElementsByTagName("head"),h.length>0&&h[0].appendChild(g)}function e(){var a="";for(key in b)a+=key+": "+b[key]+"; ";alert(a)}if(a){var b={uWidth:0,dWidth:0,ratio:1,mode:"apple",userAgent:null,bConsole:!1};c(),d(),b.bConsole&&e()}};adaptVP({uWidth:750});
                        }
                        win.addEventListener('resize',setFont,false)
                        setFont();
                    }
                    else if(mode == 'rem') {
                        var docEl = doc.documentElement,
                            resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
                            recalc = function() {
                                var clientWidth = docEl.clientWidth;
                                if(!clientWidth) return;
                                docEl.style.fontSize = 100 * (clientWidth / std) + 'px';
                            };
                        if(!doc.addEventListener) return;
                        recalc();
                        win.addEventListener(resizeEvt, recalc, false);
                        doc.addEventListener('DOMContentLoaded', recalc, false);
                    }
                }
            })(window, document, 'px');
        </script>