自适应的Js
作为一个记录,写自适应的时候加入的Js,其实也大可不必,直接定死根部front-size即可用rem。
(function flex(window, document) { var docEl = document.documentElement var dpr = window.devicePixelRatio || 1 // adjust body font size function setBodyFontSize () { if (document.body) { document.body.style.fontSize = (12 * dpr) + 'px' } else { document.addEventListener('DOMContentLoaded', setBodyFontSize) } } setBodyFontSize(); // set 1rem = viewWidth / 10 function setRemUnit () { var rem = docEl.clientWidth / 10 docEl.style.fontSize = rem + 'px' } setRemUnit() // reset rem unit on page resize window.addEventListener('resize', setRemUnit) window.addEventListener('pageshow', function (e) { if (e.persisted) { setRemUnit() } }) // detect 0.5px supports if (dpr >= 2) { var fakeBody = document.createElement('body') var testElement = document.createElement('div') testElement.style.border = '.5px solid transparent' fakeBody.appendChild(testElement) docEl.appendChild(fakeBody) if (testElement.offsetHeight === 1) { docEl.classList.add('hairlines') } docEl.removeChild(fakeBody) } }(window, document))