


The example in this article describes how to set and obtain cookies in javascript. Share it with everyone for your reference, the details are as follows:
1. Set cookies
function setCookie(cookieName,cookieValue,cookieExpires,cookiePath) { cookieValue = escape(cookieValue);//编码latin-1 if(cookieExpires=="") { var nowDate = new Date(); nowDate.setMonth(nowDate.getMonth()+6); cookieExpires = nowDate.toGMTString(); } if(cookiePath!="") { cookiePath = ";Path="+cookiePath; } document.cookie= cookieName+"="+cookieValue+";expires="+cookieExpires+cookiePath; }
2. Get cookies
function getCookieValue(cookieName) { var cookieValue = document.cookie; var cookieStartAt = cookieValue.indexOf(""+cookieName+"="); if(cookieStartAt==-1) { cookieStartAt = cookieValue.indexOf(cookieName+"="); } if(cookieStartAt==-1) { cookieValue = null; } else { cookieStartAt = cookieValue.indexOf("=",cookieStartAt)+1; cookieEndAt = cookieValue.indexOf(";",cookieStartAt); if(cookieEndAt==-1) { cookieEndAt = cookieValue.length; } cookieValue = unescape(cookieValue.substring(cookieStartAt,cookieEndAt));//解码latin-1 } return cookieValue; }
Example:
<!doctype html> <html> <head> <title>cookie</title> <meta charset="utf-8"> <script language="javascript" type="text/javascript"> //获取cookie function getCookieValue(cookieName) { var cookieValue = document.cookie; var cookieStartAt = cookieValue.indexOf(""+cookieName+"="); if(cookieStartAt==-1) { cookieStartAt = cookieValue.indexOf(cookieName+"="); } if(cookieStartAt==-1) { cookieValue = null; } else { cookieStartAt = cookieValue.indexOf("=",cookieStartAt)+1; cookieEndAt = cookieValue.indexOf(";",cookieStartAt); if(cookieEndAt==-1) { cookieEndAt = cookieValue.length; } cookieValue = unescape(cookieValue.substring(cookieStartAt,cookieEndAt));//解码latin-1 } return cookieValue; } //设置cookie function setCookie(cookieName,cookieValue,cookieExpires,cookiePath) { cookieValue = escape(cookieValue);//编码latin-1 if(cookieExpires=="") { var nowDate = new Date(); nowDate.setMonth(nowDate.getMonth()+6); cookieExpires = nowDate.toGMTString(); } if(cookiePath!="") { cookiePath = ";Path="+cookiePath; } document.cookie= cookieName+"="+cookieValue+";expires="+cookieExpires+cookiePath; } //页面加载时间处理函数 function window_onload() { var userNameElem = document.getElementById("userName");//用户名输入框对象 var passwordElem = document.getElementById("password");//密码输入框对象 var currUserElem = document.getElementById("currUser");//复选框对象 var currUser = getCookieValue("currUser"); if(currUser!=null) { userNameElem.value=currUser; currUserElem.checked = true; } if(userNameElem.value!="") { passwordElem.focus();//密码输入框获得焦点 } else { currUserElem.focus();//用户名输入框获得焦点 } } //表单提交处理 function login() { var userNameElem = document.getElementById("userName"); var passwordElem = document.getElementById("password"); var currUserElem = document.getElementById("currUser"); if(userNameElem.value=="" || passwordElem.value=="") { alert("用户名或密码不能为空!"); if(userNameElem.value=="") { userNameElem.focus();//用户名输入框获得焦点 } else { passwordElem.focus();//密码输入框获得焦点 } return false; } if(currUserElem.checked) { setCookie("currUser",userNameElem.value,"","");//设置cookie } else { var nowDate = new Date();//当前日期 nowDate.setMonth(nowDate.getMonth()-2);//将cookie的过期时间设置为之前的某个日期 cookieExpires = nowDate.toGMTString();//过期时间的格式必须是GMT日期的格式 setCookie("userName","",cookieExpires,"");//删除一个cookie只要将过期时间设置为过去的一个时间即可 } return true; } </script> <style type="text/css"> div{ font-size:12px; } </style> </head> <body onload="window_onload()"> <div> <form id="loginForm" onsubmit="return login()"> 用户名:<input type="text" id="userName"><br> 密 码:<input type="password" id="password"> <input type="checkbox" id="currUser">记住用户名<br> <input type="submit" value="登录"> </form> </div> </body> </html>
Note:
Since Google Chrome only supports online-cookies for security reasons, it has no effect when tested locally. You need to upload it to the server to try.
For more information about JavaScript operating cookies, please view the special topics on this site: " Summary of knowledge related to JavaScript operating cookies " and " Summary of jQuery's cookie operating skills "
I hope this article will be helpful to everyone in JavaScript programming.

去掉重复并排序的方法:1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句,去掉数组中的重复元素,返回去重后的新数组;2、利用sort()对去重数组进行排序,语法“去重数组.sort()”。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题,包括了Symbol类型的描述、Symbol不会隐式转字符串等问题,下面一起来看一下,希望对大家有帮助。

怎么制作文字轮播与图片轮播?大家第一想到的是不是利用js,其实利用纯CSS也能实现文字轮播与图片轮播,下面来看看实现方法,希望对大家有所帮助!

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于对象的构造函数和new操作符,构造函数是所有对象的成员方法中,最早被调用的那个,下面一起来看一下吧,希望对大家有帮助。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于面向对象的相关问题,包括了属性描述符、数据描述符、存取描述符等等内容,下面一起来看一下,希望对大家有帮助。

方法:1、利用“点击元素对象.unbind("click");”方法,该方法可以移除被选元素的事件处理程序;2、利用“点击元素对象.off("click");”方法,该方法可以移除通过on()方法添加的事件处理程序。

foreach不是es6的方法。foreach是es3中一个遍历数组的方法,可以调用数组的每个元素,并将元素传给回调函数进行处理,语法“array.forEach(function(当前元素,索引,数组){...})”;该方法不处理空数组。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于BOM操作的相关问题,包括了window对象的常见事件、JavaScript执行机制等等相关内容,下面一起来看一下,希望对大家有帮助。


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