cookie几大作用:
1.保持用户登陆状态
2.跟踪用户行为
3.制定页面
4.创建购物车
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cookie缺点:
1. 可能被禁用
2.可能被删除:cookie是一个文件,easy被用户删除
3.安全性不高
4.cookie可能与浏览器相关
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设置cookie
document.cookie = "userId = 100"; alert(document.cookie); 设置多个值: document.cookie ="userId = 100;userPass = 23256";
alert(document.cookie); |
因为在设置多个Cookie时,它获取的是所有的cookie。而不能获取指定cookie的名称的值,所以用以下的代码实现:
Document.cookie=“userld = 100”; Document.cookie = “passWord = 123456”; Var strCookie = document.cookie; Var arrCookie = strCookie.split(‘;’); Var userId; For(var I = 0; i< arrCookie.length; i++) { Var arr = arrCookie.split(‘=‘); If(‘userId’ == arr[0]) { userId = arr[1]; Break; } } Alert(userId); |
Cookie设置终止日期
var date = new Date(); var stopDays = 0.1; date.setTime(date.getTime() + stopDays*24*3600*1000); document.cookie = "userId = 100;userName = 123456;stop = "+date.toGMTString(); alert(document.cookie); |
删除Cookie: 主要是在设置终止日期的基础上减去一个时间即可了
// function deleteCookie(name) { // var date = new Date(); // date.setTime(date.getTime() - 100000); // document.cookie = name + "= afd; expires = " + date.toGMTString(); // return document.cookie; // } // alert(deleteCookie("chen")); |
设置Cookie的訪问路径
Document.cookie = “userId = 100; path = /one”; 表示仅仅能在one文件夹下使用 使用domain = 參数设置cookie的訪问主机名 Document.cookie = “ userId = 100; domain = .google.com”; 这表示全部的google.com下的全部主机都能够訪问Cookie |
加入cookie的通用函数
Function addCookie(name, value, expiresHours) { Var cookieString = name + “=” + escape(value); If(expiresHours > 0) { Var date = new Date(); Date.setTime(date.getTime() + expirsHours * 3600 * 1000); cookieString = cookieString +”; expires = “ + date.toGMTString(); } Document.cookie = cookieString; Return document.cookie; } |
指定Cookie值:getCookie(name)
function getCookie(name) { var strCookie = document.cookie; var arrCookie = strCookie.split(";"); for (var i = 0; i < arrCookie.length; i++) { var arr = arrCookie[i].split("="); if (arr[0] == name) { return arr[1]; }; }; return arr[1]; } |
删除Cookie:deleteCookie(name)
function deleteCookie(name) { var date = new Date(); date.setTime(date.getTime() - 100000); document.cookie = name + "= afd; expires = " + date.toGMTString(); return document.cookie; } |