1、以1920* 1080的设计稿为例,实现PC端不同分辨率适配

2、安装依赖

 npm install --save lib-flexible     或者  yarn add lib-flexible -save

npm  install   px2rem-loader -D 或者  yarn add px2rem-loader

npm 安装不上时可以用cnpm 

3、在utils文件下新建 一个 js 文件  如 viewport.js 代码如下
(function() { var cssText = '' + '@charset
"utf-8";html{color:#000;background:#fff;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%;-webkit-overflow-scrolling:touch}html
*{outline:0;-webkit-text-size-adjust:none;-webkit-tap-highlight-color:transparent}body,html{font-family:"Microsoft
YaHei",sans-serif,Tahoma,Arial}article,aside,blockquote,body,button,code,dd,details,div,dl,dt,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,hr,input,legend,li,menu,nav,ol,p,pre,section,td,textarea,th,ul{margin:0;padding:0;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}input,input[type=button],input[type=reset],input[type=submit]{resize:none;border:none;-webkit-appearance:none;border-radius:0}input,select,textarea{font-size:100%}table{border-collapse:collapse;border-spacing:0}fieldset,img{border:0}abbr,acronym{border:0;font-variant:normal}del{text-decoration:line-through}address,caption,cite,code,dfn,em,th,var{font-style:normal;font-weight:500}ol,ul{list-style:none}caption,th{text-align:left}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:500}q:after,q:before{content:\'\'}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}a:hover{text-decoration:underline}a,ins{text-decoration:none}a:active,a:hover,a:link,a:visited{background:0
0;-webkit-tap-highlight-color:transparent;-webkit-tap-highlight-color:transparent;outline:0;text-decoration:none}';
// cssText end var styleEl = document.createElement('style');
document.getElementsByTagName('head')[0].appendChild(styleEl); if
(styleEl.styleSheet) { if (!styleEl.styleSheet.disabled) {
styleEl.styleSheet.cssText = cssText; } } else { try { styleEl.innerHTML =
cssText; } catch (e) { styleEl.innerText = cssText; } } })(); ; (function(win,
lib) { var doc = win.document; var docEl = doc.documentElement; var metaEl =
doc.querySelector('meta[name="viewport"]'); var flexibleEl =
doc.querySelector('meta[name="flexible"]'); var dpr = 0; var scale = 0; var
tid; var flexible = lib.flexible || (lib.flexible = {}); if (metaEl) {
console.warn('将根据已有的meta标签来设置缩放比例'); var match =
metaEl.getAttribute('content').match(/initial\-scale=([\d\.]+)/); if (match) {
scale = parseFloat(match[1]); dpr = parseInt(1 / scale); } } else if
(flexibleEl) { var content = flexibleEl.getAttribute('content'); if (content) {
var initialDpr = content.match(/initial\-dpr=([\d\.]+)/); var maximumDpr =
content.match(/maximum\-dpr=([\d\.]+)/); if (initialDpr) { dpr =
parseFloat(initialDpr[1]); scale = parseFloat((1 / dpr).toFixed(2)); } if
(maximumDpr) { dpr = parseFloat(maximumDpr[1]); scale = parseFloat((1 /
dpr).toFixed(2)); } } } if (!dpr && !scale) { var isAndroid =
win.navigator.appVersion.match(/android/gi); var isIPhone =
win.navigator.appVersion.match(/iphone/gi); var devicePixelRatio =
win.devicePixelRatio; if (isIPhone) { // iOS下,对于2和3的屏,用2倍的方案,其余的用1倍方案 if
(devicePixelRatio >= 3 && (!dpr || dpr >= 3)) { dpr = 3; } else if
(devicePixelRatio >= 2 && (!dpr || dpr >= 2)) { dpr = 2; } else { dpr = 1; } }
else { // 其他设备下,仍旧使用1倍的方案 dpr = 1; } scale = 1 / dpr; }
docEl.setAttribute('data-dpr', dpr); if (!metaEl) { metaEl =
doc.createElement('meta'); metaEl.setAttribute('name', 'viewport');
metaEl.setAttribute('content', 'initial-scale=' + scale + ', maximum-scale=' +
scale + ', minimum-scale=' + scale + ', user-scalable=no'); if
(docEl.firstElementChild) { docEl.firstElementChild.appendChild(metaEl); } else
{ var wrap = doc.createElement('div'); wrap.appendChild(metaEl);
doc.write(wrap.innerHTML); } } function refreshRem() { var width =
docEl.getBoundingClientRect().width; if (width / dpr > 540) { width = width *
dpr; } var rem = width / 10; docEl.style.fontSize = rem + 'px'; flexible.rem =
win.rem = rem; } win.addEventListener('resize', function() { clearTimeout(tid);
tid = setTimeout(refreshRem, 300); }, false); win.addEventListener('pageshow',
function(e) { if (e.persisted) { clearTimeout(tid); tid =
setTimeout(refreshRem, 300); } }, false); if (doc.readyState === 'complete') {
doc.body.style.fontSize = 12 * dpr + 'px'; } else {
doc.addEventListener('DOMContentLoaded', function(e) { doc.body.style.fontSize
= 12 * dpr + 'px'; }, false); } refreshRem(); flexible.dpr = win.dpr = dpr;
flexible.refreshRem = refreshRem; flexible.rem2px = function(d) { var val =
parseFloat(d) * this.rem; if (typeof d === 'string' && d.match(/rem$/)) { val
+= 'px'; } return val; } flexible.px2rem = function(d) { var val =
parseFloat(d) / this.rem; if (typeof d === 'string' && d.match(/px$/)) { val +=
'rem'; } return val; } })(window, window['lib'] || (window['lib'] = {}));
4、在 main.js 引入 viewport.js 

5、修改build中的配置文件 utils.js ,加入以下代码

const px2remLoader = {

  loader: "px2rem-loader",

  options: {

    //这个参数是通过psd设计稿的  宽度 / 10 来计算,这里以1920为标准

    remUnit: 192

  }

};

6、修改  generateLoaders 方法中的 loaders 如下:

const loaders = options.usePostCSS

      ? [cssLoader, postcssLoader, px2remLoader]

      : [cssLoader, px2remLoader];

7、完成以上六步以后就可以按照设计图1:1开发了,单位仍然用px,例如:

温馨提示:

1、css不能写在行内,行内样式不能转为rem 

2、背景图片   background-size为  auto 不能自适应 

3、修改完以后需要重新启动项目 

 

 

 

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