HTML5中 rem适配方案与 viewport 适配问题详解Html5移动端网页端适配(js+rem)详解html5页面 rem 布局适配方法html5中JavaScript removeChild 删除所有节点

 @media screen and (min-width: 320px) { html { font-size: 32px; } } @media screen and (min-width: 375px) { html { font-size: 37.5px; } } @media screen and (min-width: 414px) { html { font-size: 41.4px; } } @media screen and (min-width: 750px) { html { font-size: 75px; } }

 //定义设计稿宽度为375 const DESIGN_WIDTH = 375; //通过设置meta元素中content的initial-scale值达到移动端适配 const setViewport = function () { //计算当前屏幕的宽度与设计稿比例 let scale = window.screen.width / DESIGN_WIDTH; // 获取元素 let meta = document.querySelector("meta[name=viewport]"); let content = `width=${DESIGN_WIDTH}, initial-scale=${scale}, maximum-scale=${scale}, minimum-scale=${scale}`; // 判断是否已存在 if (!meta) { meta = document.createElement("meta"); meta.setAttribute("name", "viewport"); document.head.appendChild(meta); } meta.setAttribute("content", content); }; setViewport(); // 监听屏幕变化事件 window.addEventListener("resize", setViewport); // 监听屏幕翻转事件 window.addEventListener("orientationchange", setViewport);