function setCookie(name,value){    var Days = 365; //此 cookie 将被保存 30 天    var exp  = new Date();    //new Date("December 31, 9998");    exp.setTime(exp.getTime() + Days*24*60*60*1000);    document.cookie = name + "="+ escape (value) + ";path=/;expires=" + exp.toGMTString();}function getCookie(name){    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));    if(arr != null) return unescape(arr[2]); return null;}function delCookie(name){    var exp = new Date();    exp.setTime(exp.getTime() - 1);    var cval=getCookie(name);    if(cval!=null) document.cookie= name + "="+cval+";path=/;expires="+exp.toGMTString();}function setPostBgPic(getDefaultBg){ var getValue=http://www.mamicode.com/getCookie("mfl_templetPostBg"); if(getValuehttp://www.mamicode.com/=="null"||getValue=http://www.mamicode.com/=null||getValuehttp://www.mamicode.com/==""){  document.body.background=getDefaultBg; }else{  document.body.background=getValue; }}