为了适配不同尺寸的屏幕，需要用到rem单位来跟随html下的fontsize尺寸变化，由于elementUI组件使用了px 单位，于是将它组件里的px单位全部转为rem。这样一来，就可以让组件使用rem单位来布局，而通过改变html下的fontsize尺寸，来让屏幕缩放。
封装px转rem函数：pxAndRemInterturn
px和rem单位互转：
content: 样式表的内容 （style里到css内容），unit: 需要替换的单位名称 （例 px）， updateUnit: 替换后的单位名称 （例 rem）， rule: 单位换算规则，多少rem = px || px = rem , 例如：当rule为100时即表示 1rem = 100px
function pxAndRemInterturn({
content,unit,rule,updateUnit}){
rule = rule || 100
if(!rule)return content;
const reg = {
px : /[\:]*[\s]*[-]*[\s]*[0-9]*[\.]*[0-9]*\p\x/g,
rem: /[\:]*[\s]*[-]*[\s]*[0-9]*[\.]*[0-9]*rem/g,
number: /[0-9]*[\.]*[0-9]*/g
}
// 获取到所有匹配的内容
const res = content.match(reg[unit])
// 传进来的是正则匹配的结构内容
function getRightData(arr){
const result = []
for(let i = 0; i <arr.length;i++){
result.push(Number(arr[i].replace(new RegExp(' ', "gm"), '').replace(':','').replace(unit,'')))
}
return result
}
const rightData = getRightData(res)
// 单位换算
function unitConversion({
num,unit,updateUnit,rule}){
let res = ''
if(unit === 'px' && updateUnit === 'rem'){
res = num / rule
}else if(unit === 'rem' && updateUnit === 'px'){
res = num * rule
}
return ' ' + res + updateUnit
}
for(let i=0;i < rightData.length;i++){
let txt = unitConversion({
num:rightData[i],
unit,
updateUnit,
rule
})
if(res[i].indexOf(':') >= 0){
txt = ': '+ txt
}
content = content.replace(res[i],txt)
}
return content
}
操作步骤
在vue项目的 /node_modules/element-ui/lib/theme-chalk/index.css 路径下找到index.css文件，也就是elementUl的css样式文件，它里面都是用px做单位的，为了将这些样式里面的px全部替换成rem，要用到我们上面写好的单位转化函数。有了这个转化函数只需建一个html文件跑一下，最后结果会在html显示出来，将他们作为内容自建一个index.css文件，替换 /node_modules/element-ui/lib/theme-chalk/index.css 这个文件就可以了，在main.js中引入elementUI的这个css，其实就是照旧引入，但现在它组件里的css已经是用的rem单位的了。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<button style="vertical-align:top;line-height: 40px;">你好</button>
</body >
<style>
@charset "UTF-8";@font-face{font-family:element-icons;src:url(fonts/element-icons.woff) format("woff"),url(fonts/element-icons.ttf) format("truetype");font-weight:400;font-display:"auto";font-style:normal}[class*=" el-icon-"],[class^=el-icon-]{font-family:element-icons!important;speak:none;font-style:normal;font-weight:400;font-variant:normal;text-transform:none;line-height:1;vertical-align:baseline;display:inline-block;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.el-icon-ice-cream-round:before{content:"\e6a0"}.el-icon-ice-cream-square:before{content:"\e6a3"}.el-icon-lollipop:before{content:"\e6a4"}.el-icon-potato-strips:before{content:"\e6a5"}.el-icon-milk-tea:before{content:"\e6a6"}.el-icon-ice-drink:before{content:"\e6a7"}.el-icon-ice-tea:before{content:"\e6a9"}.el-icon-coffee:before{content:"\e6aa"}.el-icon-orange:before{content:"\e6ab"}.el-icon-pear:before{content:"\e6ac"}.el-icon-apple:before{content:"\e6ad"}.el-icon-cherry:before{content:"\e6ae"}.el-icon-watermelon:before{content:"\e6af"}.el-icon-grape:before{content:"\e6b0"}.el-icon-refrigerator:before{content:"\e6b1"}.el-icon-goblet-square-full:before{content:"\e6b2"}.el-icon-goblet-square:before{content:"\e6b3"}.el-icon-goblet-full:before{content:"\e6b4"}.el-icon-goblet:before{content:"\e6b5"}.el-icon-cold-drink:before{content:"\e6b6"}.el-icon-coffee-cup:before{content:"\e6b8"}.el-icon-water-cup:before{content:"\e6b9"}.el-icon-hot-water:before{content:"\e6ba"}.el-icon-ice-cream:before{content:"\e6bb"}.el-icon-dessert:before{content:"\e6bc"}.el-icon-sugar:before{content:"\e6bd"}.el-icon-tableware:before{content:"\e6be"}.el-icon-burger:before{content:"\e6bf"}.el-icon-knife-fork:before{content:"\e6c1"}.el-icon-fork-spoon:before{content:"\e6c2"}.el-icon-chicken:before{content:"\e6c3"}.el-icon-food:before{content:"\e6c4"}.el-icon-dish-1:before{content:"\e6c5"}.el-icon-dish:before{content:"\e6c6"}.el-icon-moon-night:before{content:"\e6ee"}.el-icon-moon:before{content:"\e6f0"}.el-icon-cloudy-and-sunny:before{content:"\e6f1"}.el-icon-partly-cloudy:before{content:"\e6f2"}.el-icon-cloudy:before{content:"\e6f3"}.el-icon-sunny:before{content:"\e6f6"}.el-icon-sunset:before{content:"\e6f7"}.el-icon-sunrise-1:before{content:"\e6f8"}.el-icon-sunrise:before{content:"\e6f9"}.el-icon-heavy-rain:before{content:"\e6fa"}.el-icon-lightning:before{content:"\e6fb"}.el-icon-light-rain:before{content:"\e6fc"}.el-icon-wind-power:before{content:"\e6fd"}.el-icon-baseball:before{content:"\e712"}.el-icon-soccer:before{content:"\e713"}.el-icon-football:before{content:"\e715"}.el-icon-basketball:before{content:"\e716"}.el-icon-ship:before{content:"\e73f"}.el-icon-truck:before{content:"\e740"}.el-icon-bicycle:before{content:"\e741"}.el-icon-mobile-phone:before{content:"\e6d3"}.el-icon-service:before{content:"\e6d4"}.el-icon-key:before{content:"\e6e2"}.el-icon-unlock:before{content:"\e6e4"}.el-icon-lock:before{content:"\e6e5"}.el-icon-watch:before{content:"\e6fe"}.el-icon-watch-1:before{content:"\e6ff"}.el-icon-timer:before{content:"\e702"}.el-icon-alarm-clock:before{content:"\e703"}.el-icon-map-location:before{content:"\e704"}.el-icon-delete-location:before{content:"\e705"}.el-icon-add-location:before{content:"\e706"}.el-icon-location-information:before{content:"\e707"}.el-icon-location-outline:before{content:"\e708"}.el-icon-location:before{content:"\e79e"}.el-icon-place:before{content:"\e709"}.el-icon-discover:before{content:"\e70a"}.el-icon-first-aid-kit:before{content:"\e70b"}.el-icon-trophy-1:before{content:"\e70c"}.el-icon-trophy:before{content:"\e70d"}.el-icon-medal:before{content:"\e70e"}.el-icon-medal-1:before{content:"\e70f"}.el-icon-stopwatch:before{content:"\e710"}.el-icon-mic:before{content:"\e711"}.el-icon-copy-document:before{content:"\e718"}.el-icon-full-screen:before{content:"\e719"}.el-icon-switch-button:before{content:"\e71b"}.el-icon-aim:before{content:"\e71c"}.el-icon-crop:before{content:"\e71d"}.el-icon-odometer:before{content:"\e71e"}.el-icon-time:before{content:"\e71f"}.el-icon-bangzhu:before{content:"\e724"}.el-icon-close-notification:before{content:"\e726"}.el-icon-microphone:before{content:"\e727"}.el-icon-turn-off-microphone:before{content:"\e728"}.el-icon-position:before{content:"\e729"}.el-icon-postcard:before{content:"\e72a"}.el-icon-message:before{content:"\e72b"}.el-icon-chat-line-square:before{content:"\e72d"}.el-icon-chat-dot-square:before{content:"\e72e"}.el-icon-chat-dot-round:before{content:"\e72f"}.el-icon-chat-square:before{content:"\e730"}.el-icon-chat-line-round:before{content:"\e731"}.el-icon-chat-round:before{content:"\e732"}.el-icon-set-up:before{content:"\e733"}.el-icon-turn-off:before{content:"\e734"}.el-icon-open:before{content:"\e735"}.el-icon-connection:before{content:"\e736"}.el-icon-link:before{content:"\e737"}.el-icon-cpu:before{content:"\e738"}.el-icon-thumb:before{content:"\e739"}.el-icon-female:before{content:"\e73a"}.el-icon-male:before{content:"\e73b"}.el-icon-guide:before{content:"\e73c"}.el-icon-news:before{content:"\e73e"}.el-icon-price-tag:before{content:"\e744"}.el-icon-discount:before{content:"\e745"}.el-icon-wallet:before{content:"\e747"}.el-icon-coin:before{content:"\e748"}.el-icon-money:before{content: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