代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> div { width: 2rem; height: 2rem; background-color: red; } </style> </head> <body> <div></div> <script src="./js/flexible.js"></script> </body> </html>
(function flexible (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))
直接在body最后面引入
<script src="./js/flexible.js"></script>
就可以使用了，不用自己适配一些视口了，爽死，可以直接拿来使用。
