备用https://blog.csdn.net/qq_36679270/article/details/120334780?spm=1001.2014.3001.5501 <script type="text/javascript"> function is_weixin() { var ua = navigator.userAgent.toLowerCase(); if (ua.match(/MicroMessenger/i) == "micromessenger") { return true; } else { return false; } } var isWeixin = is_weixin(); var winHeight = typeof window.innerHeight != 'undefined' ? window.innerHeight: document.documentElement.clientHeight; function loadHtml() { var div = document.createElement('div'); div.id = 'weixin-tip'; div.innerHTML = '<p><img src="https://p15.qhimg.com/t01174ef4302f59fce3.png?https://mapp.alicdn.com/16306714822555obrw02Y9RzuSry.png?http://zhizunwangqing.gitee.io/zaluan1/111/weixinchuangkou/zhedang.png" alt="微信打开"/></p>'; document.body.appendChild(div); } function loadStyleText(cssText) { var style = document.createElement('style'); style.rel = 'stylesheet'; style.type = 'text/css'; try { style.appendChild(document.createTextNode(cssText)); } catch(e) { style.styleSheet.cssText = cssText; //ie9以下 } var head = document.getElementsByTagName("head")[0]; //head标签之间加上style样式 head.appendChild(style); } var cssText = "#weixin-tip{position: fixed; left:0; top:0; background: rgba(0,0,0,0.8); filter:alpha(opacity=80); width: 100%; height:100%; z-index: 100;} #weixin-tip p{text-align: center; margin-top: 10%; padding:0 5%;}"; if (isWeixin) { loadHtml(); loadStyleText(cssText); } </script>