//footer的微信微博头条的二维码的显示与隐藏
         var contact_logo=$(".contact-logo");
         var contact_code=$(".code");
         var contact_logo_length=contact_logo.length;
         contact_logo.each(function(i,item){
            $(item).hover(function(){
                for(var j=0;j<contact_logo_length;j++){
                    contact_code.eq(j).css("display","none");
                }
                contact_code.eq(i).css("display","block");
            },function(){
                for(var j=0;j<contact_logo_length;j++){
                    contact_code.eq(j).css("display","none");
                }
            })
        })