使用cookie记录点击/浏览历史并以json格式存入

if (len > 2) {
                    json1.splice(0, 1);
}

<div class="clx-3">
    <ul id="searchCityListB">
        <li><a class="col1" data-areaId="1" >测试1</a></li>
        <li><a class="col1" data-areaId="2" ><span class="">测试2</span></a></li>
        <li><a class="col1" data-areaId="3" ><span class="">测试3</span></a></li>
        <li><a class="col1" data-areaId="4" ><span class="">测试4</span></a></li>
        <li><a class="col1" data-areaId="5" ><span class="">测试5</span></a></li>
        <li><a class="col1" data-areaId="6" ><span class="">测试6</span></a></li>
    </ul>
</div>

*{margin:0; padding: 0;}
.clx-3{ width: 100%;}
.clx-3 li{ float: left; list-style: none; width: 33.333%; line-height: 50px; text-align: center; border-bottom: #ddd 1px solid; border-right: #ddd 1px solid; box-sizing: border-box}
.clx-3 li:nth-child(3n+0){ border-right: none}

$(document).on(‘click‘, ‘#searchCityListB li‘, function (event) {
        var areaIdS = $(this).children().attr("data-areaid");
        var cityNameS = $(this).children().text();
        setHistoryK(cityNameS, areaIdS);
    });

    //设置cookies
    function setHistoryK(cityNameS, areaIdS) {
        var len = 0;
        var canAdd = true;
        var historyData, json1;
        var firstStr = " [" +
                " {\"cityName\":\"" + cityNameS + "\"," +
                " \"areaId\":" + areaIdS + "}" +
                " ]";

        var jsonFirstStr = JSON.stringify(firstStr);

        if (!getCookie("cityHistory")) { //第一次的时候需要初始化
            setCookie("cityHistory", jsonFirstStr);
        } else {  //已经存在
            historyData = getCookie("cityHistory");
            json1 = eval("(" + historyData + ")");
            if (typeof(json1) == "string") {
                json1 = JSON.parse(json1);
            }

            len = json1.length;


            $(json1).each(function () {
                if (this.cityName == cityNameS) {
                    canAdd = false;
                    return false;
                }
            });

            if (canAdd == true) {
                if (len > 2) {
                    json1.splice(0, 1);
                }

                var newJsonStr = {"cityName": cityNameS, "areaId": areaIdS},jsonSetStr;
                json1.push(newJsonStr); //添加一个新的记录
                jsonSetStr = JSON.stringify(json1);
                setCookie("cityHistory", jsonSetStr);
                console.log(jsonSetStr);
            }
        }


    }

//写cookies
function setCookie(name,value)
{
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

//获取cookies
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
    if(arr=document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}

//检查cookies
function checkCookie(c_name){
    if (document.cookie.length>0)
      {
      c_start=document.cookie.indexOf(c_name + "=")
      if (c_start>0)
        var arr = new Array();
       arr = document.cookie.split(";");
       return arr.length
      }
}


//删除cookies
function delCookie(name)
{
    var keys=document.cookie.match(/[^ =;]+(?=\=)/g);
    if (keys) {
        for (var i = keys.length; i--;)
            document.cookie=keys[i]+‘=0;expires=‘ + new Date( 0).toUTCString()
    }
}