全局引入

(function(doc, win) {const docEl = doc.documentElement,resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize'const setFont = function() {let clientWidth = docEl.clientWidth;if (!clientWidth) return;if (clientWidth >= 750) {docEl.style.fontSize = '16px';} else {docEl.style.fontSize = 16 * (clientWidth / 750) + 'px';}};doc.addEventListener('DOMContentLoaded', setFont, false)win.addEventListener(resizeEvt, setFont, false)win.addEventListener('load', setFont, false)
})(document, window);

以1rem为16px为准设置html标签fontSize，蓝湖则设置如下图！搞定😊