Different js clients display different advertisements (pc end + mobile end + WeChat end)

var IsSpider=/spider|bot/();
var IsMobile=/ipad|iphone|ipod|android|mobile/();
var IsWeixin=/micromessenger/();

var i;
web=[];
mob=[];
wex=[];
// Ask the headweb['single_question_banner']='pc ad code';
mob['single_question_banner']='Mobile Advertising Code';
wex['single_question_banner']='WeChat Advertising Code';
// Headerweb['single_question_bottom']='';
mob['single_question_bottom']='';
wex['single_question_bottom']='';

if (IsMobile) {
	for (i in web) {
	  web[i] = mob[i];
	}
}

function growing(id) {
    if(IsSpider)return;
    (web[id]);
}

var browser={    
		versions:function(){            
				var u = , app = ;            
				return {                
					trident: ('Trident') > -1,               
					presto: ('Presto') > -1,                
					webKit: ('AppleWebKit') > -1,              
					gecko: ('Gecko') > -1 && ('KHTML') == -1,               
					mobile: !!(/AppleWebKit.*Mobile.*/)||!!(/AppleWebKit/),          
					ios: !!(/\(i[^;]+;( U;)? CPU.+Mac OS X/),                 
					android: ().indexOf('android') > -1 ,   
					iPhone: ('iPhone') > -1 || ('Mac') > -1,               
					iPad: ('iPad') > -1,               
					webApp: ('Safari') == -1           
				};
				}()
}
if (!( ||  ||  || )){
 
("<div class=\'float_layer\' id=\'miaov_float_layer\' style=\'z-index:10001;\'>");
("    <div class=\'content\'>");
("        <div class=\'wrap\'> ");
("        <a href=\'/\' target=\'_blank\'><img src=\'/ad1/\' width=\'300\' height=\'250\' /></a>");
("        </div>");
("    </div>");
("</div>");
}