如果用不了可能是版本問題，實在不行建議嘗試下，以下版本
"less": "^3.0.4", "less-loader": "^5.0.0"
less-loader安裝失敗的話,后面添加--legacy-peer-deps
npm install less-loader@5.0.0 --save --legacy-peer-deps
flexible.js

(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 () {
        // 這里默認是10等份，手動改為24，此時1rem=1920/24px即80px。（設(shè)計稿是1920px的）
        var rem = docEl.clientWidth / 24
        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)

home.js

<script>
import '@/utils/flexible'
...
</script>
<style lang="less" scoped>
@r: 80rem;
...
  height: 688 /@r; //688px
...
</style>