思路:使用lib-flexible
结合postcss-pxtorem
实现
第一步
在项目utils下建立flexible.js文件(直接下载则不用新建该文件)
第二部
复制以下代码到刚建好的文件中或者直接yarn install lib-flexible-pc-y
// 基于 libflexible 用来适配pc端
(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'] = {}));
第三步
下载postcss-pxtorem
yarn install [email protected]
(5.1.1较稳定)
第四步
项目postcssrc.js文件下加入以下代码
const px2rem = require('postcss-pxtorem');
const postcss = px2rem({
rootValue: 192,
unitPrecision: 5,
propList:['*']
});
其他配置可参考 https://www.npmjs.com/package/postcss-pxtorem
第五步
项目main.js中引入文件
import '@/utils/flexible.js
直接通过yarn下载的flexible文件,则直接引入即可
import 'lib-flexible-pc-y'