<p><strong class="ql-size-large">// rem 响应式布局公式</strong></p><p><strong class="ql-size-large">(function(doc,win){</strong></p><p><strong class="ql-size-large"> let docEl = doc.documentElement;</strong></p><p><strong class="ql-size-large"> let resizeEt = 'orientationchange' in window? 'orientationchange':'resize';</strong></p><p><strong class="ql-size-large"> let recalc = function(){</strong></p><p><strong class="ql-size-large"> let clientWidth = docEl.clientWidth;</strong></p><p><strong class="ql-size-large"> if(!clientWidth) return;</strong></p><p><strong class="ql-size-large"> if(clientWidth&gt;=750){</strong></p><p><strong class="ql-size-large"> docEl.style.fontSize = '100px';</strong></p><p><strong class="ql-size-large"> }else{</strong></p><p><strong class="ql-size-large"> docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';</strong></p><p><strong class="ql-size-large"> }</strong></p><p><strong class="ql-size-large"> };</strong></p><p><br></p><p><strong class="ql-size-large"> if(!doc.addEventListener) return ;</strong></p><p><strong class="ql-size-large"> win.addEventListener(resizeEt,recalc,false);</strong></p><p><strong class="ql-size-large"> doc.addEventListener('DOMContentLoaded',recalc,false);</strong></p><p><strong class="ql-size-large"> recalc();</strong></p><p><strong class="ql-size-large">})(document,window);</strong></p>