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js设置、修改、获取、删除 cookie

2016-07-28 13:45 585 查看

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>cookie</title>
<script src="jquery.js" type="text/javascript"></script>
</head>
<body>
<form id="formId" action="">
<input type="text" name="a" value="安安" />
<input type="hidden" name="b" value="abc">

</form>
<script type="text/javascript">
/**
* 设置cookie
* @param {string} name  键名
* @param {string} value 键值
* @param {integer} days cookie周期
*/
function setCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}else{
var expires = "";
}
document.cookie = name+"="+value+expires+"; path=/";
}

// 获取cookie
function getCookie(name) {
var nameEQ = name + "=";
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,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

// 删除cookie
function deleteCookie(name) {
setCookie(name,"",-1);
}

setCookie('userName','wh',0.001);
// alert(getCookie('userName'));
// deleteCookie('userName');
</script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>cookies-2</title>
<script src="jquery.js" type="text/javascript"></script>
</head>
<body>
<script type="text/javascript">
/**
* 设置cookie
* @param {string} name  键名
* @param {string} value 键值
* @param {integer} days cookie周期
*/
function setCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}else{
var expires = "";
}
document.cookie = name+"="+value+expires+"; path=/";
}

// 获取cookie
function getCookie(name) {
var nameEQ = name + "=";
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,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

// 删除cookie
function deleteCookie(name) {
setCookie(name,"",-1);
}

// setCookie('userName','wh',0.001);
alert(getCookie('userName'));
// deleteCookie('userName');
</script>
</body>
</html>

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