js设置cookie有很多种方法。
第一种:(这个是w3c官网的代码)
<script> //设置cookie function setCookie(cname, cvalue, exdays) { var d = new Date(); d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000)); var expires = "expires=" + d.toUTCString(); document.cookie = cname + "=" + cvalue + "; " + expires; } //获取cookie function getCookie(cname) { var name = cname + "="; var ca = document.cookie.split(';'); for (var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1); if (c.indexOf(name) != -1) return c.substring(name.length, c.length); } return ""; } //清除cookie function clearCookie(name) { setCookie(name, "", -1); } function checkCookie() { var user = getCookie("username"); if (user != "") { alert("Welcome again " + user); } else { user = prompt("Please enter your name:", ""); if (user != "" && user != null) { setCookie("username", user, 365); } } } checkCookie(); </script>
第二种:
<script> //JS操作cookies方法! //写cookies function setCookie(c_name, value, expiredays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + expiredays); document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString()); } //读取cookies function getCookie(name) { var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)"); if (arr = document.cookie.match(reg)) return (arr[2]); else return null; } //删除cookies function delCookie(name) { var exp = new Date(); exp.setTime(exp.getTime() - 1); var cval = getCookie(name); if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString(); } //使用示例 setCookie('username', 'Darren', 30) alert(getCookie("username")); </script>
第三个例子
<html> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <head> <script language="JavaScript" type="text/javascript"> function addCookie(objName, objValue, objHours) {//添加cookie var str = objName + "=" + escape(objValue); if (objHours > 0) {//为0时不设定过期时间,浏览器关闭时cookie自动消失 var date = new Date(); var ms = objHours * 3600 * 1000; date.setTime(date.getTime() + ms); str += "; expires=" + date.toGMTString(); } document.cookie = str; alert("添加cookie成功"); } function getCookie(objName) {//获取指定名称的cookie的值 var arrStr = document.cookie.split("; "); for (var i = 0; i < arrStr.length; i++) { var temp = arrStr[i].split("="); if (temp[0] == objName) return unescape(temp[1]); } } function delCookie(name) {//为了删除指定名称的cookie,可以将其过期时间设定为一个过去的时间 var date = new Date(); date.setTime(date.getTime() - 10000); document.cookie = name + "=a; expires=" + date.toGMTString(); } function allCookie() {//读取所有保存的cookie字符串 var str = document.cookie; if (str == "") { str = "没有保存任何cookie"; } alert(str); } function $(m, n) { return document.forms[m].elements[n].value; } function add_() { var cookie_name = $("myform", "cookie_name"); var cookie_value = $("myform", "cookie_value"); var cookie_expireHours = $("myform", "cookie_expiresHours"); addCookie(cookie_name, cookie_value, cookie_expireHours); } function get_() { var cookie_name = $("myform", "cookie_name"); var cookie_value = getCookie(cookie_name); alert(cookie_value); } function del_() { var cookie_name = $("myform", "cookie_name"); delCookie(cookie_name); alert("删除成功"); } </script> </head> <body> <form name="myform"> <div> <label for="cookie_name"> 名称 </label> <input type="text" name="cookie_name" /> </div> <div> <label for="cookie_value"> 值 </lable> <input type="text" name="cookie_value" /> </div> <div> <label for="cookie_expireHours"> 多少个小时过期 </lable> <input type="text" name="cookie_expiresHours" /> </div> <div> <input type="button" value="添加该cookie" onclick="add_()" /><input type="button" value="读取所有cookie" onclick="allCookie()" /><input type="button" value="读取该名称cookie" onclick="get_()" /><input type="button" value="删除该名称cookie" onclick="del_()" /> </div> </form> </body> </html>
注意:
chrome浏览器在本地获取不到cookie。必须在服务器上才可以。如果是本地的话,你可以放到local的www目录下面。
Google Chrome只支持在线网站的cookie的读写操作,对本地html的cookie操作是禁止的。所以下面的代码如果你写在一个本地的html文件中,将弹出的对话框内容为空。
document.cookie = "Test=cooo"; alert(document.cookie);
如果这个页面是在线网站的内容,则会正常显示cookie内容Test=cooo等等。
摘自:https://www.cnblogs.com/wangkongming/p/3992644.html
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