How to use js to save browsing history with cookies_javascript skills

The example in this article describes the method of js operating cookies to save browsing records. Share it with everyone for your reference, the details are as follows:

Note: Recently made a function to record the product pages viewed by users. My idea is that every time the customer enters the product page, he or she calls JS to save the product information in the cookie in the form of json.

The display of browsing history is read from the cookie, and then parsed into json to generate html elements. Because the user may open several pages at the same time, these pages may have browsing records. In order to display the browsing records, they are refreshed once every second.

Two js files are used, history.js, the key chat record saving and reading code. json.js, processes json.

history.js

var addHistory=function(num,id){
  stringCookie=getCookie('history');
  var stringHistory=""!=stringCookie?stringCookie:"{history:[]}";
  var json=new JSON(stringHistory);
  var e="{num:"+num+",id:"+id+"}";
  json['history'].push(e);//添加一个新的记录
  setCookie('history',json.toString(),30);
}
//显示历史记录
var DisplayHistory=function(){
  var p_ele=document.getElementById('history');
   while (p_ele.firstChild) {
   p_ele.removeChild(p_ele.firstChild);
   }
  var historyJSON=getCookie('history');
  var json=new JSON(historyJSON);
  var displayNum=6;
  for(i=json['history'].length-1;i>0;i--){
    addLi(json['history'][i]['num'],json['history'][i]['id'],"history"); 
    displayNum--;
    if(displayNum==0){break;}
  }
}
//添加一个li元素
var addLi=function(num,id,pid){
  var a=document.createElement('a');
  var href='product.action?pid='+id;
  a.setAttribute('href',href);
  var t=document.createTextNode(num);
  a.appendChild(t);
  var li=document.createElement('li');
  li.appendChild(a);
  document.getElementById(pid).appendChild(li);
}
//添加cookie
var setCookie=function(c_name,value,expiredays)
{
  var exdate=new Date()
  exdate.setDate(exdate.getDate()+expiredays)
  cookieVal=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
//  alert(cookieVal);
  document.cookie=cookieVal;
}
//获取cookie
function getCookie(c_name)
{
  if (document.cookie.length>0)
   {
   c_start=document.cookie.indexOf(c_name + "=")
   if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1
    c_end=document.cookie.indexOf(";",c_start)
    if (c_end==-1) c_end=document.cookie.length
//    document.write(document.cookie.substring(c_start,c_end)+"<br>");
    return unescape(document.cookie.substring(c_start,c_end))
    }
   }
  return ""
}

json.js

var JSON = function(sJSON){
  this.objType = (typeof sJSON);
  this.self = [];
  (function(s,o){for(var i in o){o.hasOwnProperty(i)&&(s[i]=o[i],s.self[i]=o[i])};})(this,(this.objType=='string')?eval('0,'+sJSON):sJSON);
}
JSON.prototype = {
  toString:function(){
    return this.getString();
  },
  valueOf:function(){
    return this.getString();
  },
  getString:function(){
    var sA = [];
    (function(o){
      var oo = null;
      sA.push('{');
      for(var i in o){
        if(o.hasOwnProperty(i) && i!='prototype'){
          oo = o[i];
          if(oo instanceof Array){
            sA.push(i+':[');
            for(var b in oo){
              if(oo.hasOwnProperty(b) && b!='prototype'){
                sA.push(oo[b]+',');
                if(typeof oo[b]=='object') arguments.callee(oo[b]);
              }
            }
            sA.push('],');
            continue;
          }else{
            sA.push(i+':'+oo+',');
          }
          if(typeof oo=='object') arguments.callee(oo);
        }
      }
      sA.push('},');
    })(this.self);
    return sA.slice(0).join('').replace(/
objectobject
,/ig,'').replace(/,\}/g,'}').replace(/,\]/g,']').slice(0,-1);
  },
  push:function(sName,sValue){
    this.self[sName] = sValue;
    this[sName] = sValue;
  }
}

I hope this article will be helpful to everyone in JavaScript programming.