rem

;(function(document, window) {

let designWidth = 750 // 设计稿宽度

document.documentElement.style.fontSize =

(document.documentElement.clientWidth / designWidth) * 100 + 'px'

window.onresize = function() {

document.documentElement.style.fontSize =

(document.documentElement.clientWidth / designWidth) * 100 + 'px'

}

})(document, window)