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<script>
//           微信界面打开有图片罩住的效果js(这是symfony框架下的代码)。
                var downurl= '<?= $downurl?>';
                var wapurl = '<?= $wapurl?>';
                function is_weixin() {
                    var ua = navigator.userAgent.toLowerCase();
                    if (ua.match(/MicroMessenger/i) == "micromessenger") {
                        return true;
                    }
                }

                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 id="wx-img" src="{{ assetUrl('images/live_weixin.png','res') }}" 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: absolute; left:0; top:0; background: rgba(0,0,0,0.8); filter:alpha(opacity=80); width: 100%; height:960px; z-index: 1000;} #weixin-tip p{text-align: center; margin-top: 10%; padding:0 5%;}#wx-img{ width: 95%; position: absolute;left: 15px;top: 0px;}";

                if(isWeixin){
                    loadHtml();
                    loadStyleText(cssText);
                }
<script>

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