移动端H5实现全屏（横屏）

const fullW = window.innerWidth ||
        window.document.documentElement.clientWidth || window.document.body.clientWidth;
const fullH = window.innerHeight ||
        window.document.documentElement.clientHeight || window.document.body.clientHeight;
const cssText = `transform: rotate(90deg) translate(${((fullH - fullW) / 2)}px, ${((fullH - fullW) / 2)}px) translateZ(1px);` +
    `width: ${fullH}px;` +
    `height: ${fullW}px;` +
    `background: antiquewhite;` +
    `font-size: 20px;`;
const fullCss = `.full-screen-wrap {${cssText}}`;
 
document.getElementsByTagName('style')[0].append(fullCss);