if(getQueryVariable("visit_rand_id")){throw SyntaxError();}//如果发现url参数带有visit_rand_id就不要执行后面的程序，因为带有visit_rand_id是用来关联访客id的
var visitor_id=getCookie("visitor_id")//记录是不是今天的老用户
var rand_id=getCookie("rand_id");
if(!visitor_id){
    if(!rand_id){
        //做个关联页面
        rand_id=getRandom(20);
        var div=document.createElement("iframe");
        div.src="/index.php/index/visit/set_visit?visit_rand_id=visit_rand_"+rand_id;
        div.style="display:none;position:absolute;top:-199999px;left:-19999px";
        document.body.appendChild(div);
        setCookie("rand_id",rand_id);
    }
    var myVar = setInterval(function(){
        //将用户信息对应上
        $.get("/index.php/index/visit/relationVisitorId",{
            'visit_rand_id':rand_id,
        },function(result){
            if(result.visitor_id){
                console.log(result.visitor_id);
                setCookie("visitor_id",result.visitor_id);
                clearInterval(myVar);
            }
        },"json");
    },3000);
   
}else{
    //抓取统计数据
    //console.log('抓取统计数据');
    setTimeout(function(){
        $.get("/index.php/index/visit/index");
    },1000)
}

//获取指定位数的随机数
function getRandom(num){
    var random = Math.floor((Math.random()+Math.floor(Math.random()*9+1))*Math.pow(10,num-1));
    return random;
}
//获取url参数
function getQueryVariable(variable)
{
       var query = window.location.search.substring(1);
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}

//取得cookie
function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');    //把cookie分割成组
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];                      //取得字符串
        while (c.charAt(0)==' ') {          //判断一下字符串有没有前导空格
            c = c.substring(1,c.length);      //有的话，从第二位开始取
            }
            if (c.indexOf(nameEQ) == 0) {       //如果含有我们要的name
                return unescape(c.substring(nameEQ.length,c.length));    //解码并截取我们要值
            }
    }
    return false;
}

//清除cookie
function clearCookie(name) {
    setCookie(name, "", -1);
}

//设置cookie 设置今天23.59.59过期
function setCookie(name, value) {
    var expires = "";
    expires = "; expires="+new Date(new Date(new Date().toLocaleDateString()).getTime()+24*60*60*1000*365);
    document.cookie = name+"="+escape(value)+expires+"; path=/";   //转码并赋值
}