function showtab(a) { var mainChildren = document.querySelector(".mainpadd").children; if(a==1) { for (i=1; i<mainChildren.length; i++) { mainChildren[i].style.display="none"; } document.getElementById("container2").style.display="block"; document.getElementById("container3").style.display="none";} else if(a==2) { for (i=1; i<mainChildren.length; i++) {mainChildren[i].style.display="block";}document.getElementById("container2").style.display="none"; document.getElementById("container3").style.display="none";} else {for (i=1; i<mainChildren.length; i++) { mainChildren[i].style.display="none"; } document.getElementById("container2").style.display="none"; document.getElementById("container3").style.display="block";}}document.write("<ul>");document.write("<li><a target=\"_blank\" href=\"http://news.znds.com/article/52443.html\">《上海空中课堂》OTT独家播放平台落地BesTV优视猫</a></li>");document.write("<li><a target=\"_blank\" href=\"http://news.znds.com/article/37695.html\">聚合类视频应用会是用户的下一个落脚点吗？</a></li>");document.write("</ul>");document.getElementById("necessary_tab").innerHTML='<li class="nownav" id="tab3" onmouseover="showtab(3)" style="border-right: 1px solid; padding-right: 16px;"><h2>相关推荐</h2></li><li class="nownav active" id="tab2" onmouseover="showtab(1);" style="border-right: 1px solid; padding-right: 16px;"><h2>相关资讯</h2></li><li class="nownav" id="tab1" onmouseover="showtab(2)"><h2>BesTV优视猫历史版本</h2></li>';showtab(3);