function adapt(designWidth, rem2px){ var d = window.document.createElement('div'); d.style.width = '1rem'; d.style.display = "none"; var head = window.document.getElementsByTagName('head')[0]; head.appendChild(d); var defaultFontSize = parseFloat(window.getComputedStyle(d, null).getPropertyValue('width')); d.remove(); document.documentElement.style.fontSize = window.innerWidth / designWidth * rem2px / defaultFontSize * 100 + '%'; var st = document.createElement('style'); var portrait = "@media screen and (min- "+window.innerWidth+"px) {html{font-size:"+((window.innerWidth/(designWidth/rem2px)/defaultFontSize)*100) +"%;}}"; var landscape = "@media screen and (min- "+window.innerHeight+"px) {html{font-size:"+((window.innerHeight/(designWidth/rem2px)/defaultFontSize)*100) +"%;}}" st.innerHTML = portrait + landscape; head.appendChild(st); return defaultFontSize }; var defaultFontSize = adapt(640, 100);
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