js中的cookie操作详解编程语言

cookie指某些网站为了辨别用户身份、进行session跟踪而储存在用户本地终端上的数据（通常经过加密）

在网站客户端中保存数据，可以减少服务器的压力

// Cookie操作对象 
var Cookies = {}; 
// cookie设置 
Cookies.set = function(name, value){ 
     var argv = arguments; 
     var argc = arguments.length; 
     var expires = (argc > 2) ? argv[2] : null; 
     var path = (argc > 3) ? argv[3] : '/'; 
     var domain = (argc > 4) ? argv[4] : null; 
     var secure = (argc > 5) ? argv[5] : false; 
     document.cookie = name + "=" + escape (value) + 
       ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
       ((path == null) ? "" : ("; path=" + path)) + 
       ((domain == null) ? "" : ("; domain=" + domain)) + 
       ((secure == true) ? "; secure" : ""); // secure值为true时，在http中是无效的；在https中才有效 
}; 
// cookie获取 
Cookies.get = function(name){ 
    var arg = name + "="; 
    var alen = arg.length; 
    var clen = document.cookie.length; 
    var i = 0; 
    var j = 0; 
    while(i < clen){ 
        j = i + alen; 
        if (document.cookie.substring(i, j) == arg) 
            return Cookies.getCookieVal(j); 
        i = document.cookie.indexOf(" ", i) + 1; 
        if(i == 0) 
            break; 
    } 
    return null; 
}; 
// cookie删除 
Cookies.del = function(name) { 
  if(Cookies.get(name)){ 
    var expdate = new Date(); 
    expdate.setTime(expdate.getTime() - (86400 * 1000 * 1)); 
    Cookies.set(name, "", expdate); 
  } 
};

来自：
js中的cookie操作