自动生成跟字体大小;-----------------供参考!!!
(function(baseFontSize, fontscale) { var _baseFontSize = baseFontSize || 100; var _fontscale = fontscale || 1; var win = window; var doc = win.document; var ua = navigator.userAgent; var matches = ua.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i); var UCversion = ua.match(/U3\/((\d+|\.){5,})/i); var isUCHd = UCversion && parseInt(UCversion[1].split('.').join(''), 10) >= 80; var isIos = navigator.appVersion.match(/(iphone|ipad|ipod)/gi); var dpr = win.devicePixelRatio || 1; if (!isIos && !(matches && matches[1] > 534) && !isUCHd) { // 如果非iOS, 非Android4.3以上, 非UC内核, 就不执行高清, dpr设为1; dpr = 1; } var scale = 1 / dpr; var metaEl = doc.querySelector('meta[name="viewport"]'); if (!metaEl) { metaEl = doc.createElement('meta'); metaEl.setAttribute('name', 'viewport'); doc.head.appendChild(metaEl); } metaEl.setAttribute('content', 'width=device-width,user-scalable=no,initial-scale=' + scale + ',maximum-scale=' + scale + ',minimum-scale=' + scale); doc.documentElement.style.fontSize = _baseFontSize / 2 * dpr * _fontscale + 'px'; window.fontSizeNum = _baseFontSize / 2 * dpr * _fontscale; window.viewportScale = dpr; })(document.documentElement.clientWidth / 3.6); console.log(document.documentElement.clientWidth); 文章来源: px与rem转换