2019独角兽企业重金招聘Python工程师标准>>> 
1 JS中Cookie的结构： 在JavaScript中，cookie是以键值对的形式保存的，即key=value的格式，各个Cookie之间一般是以分号;分隔
2 示例：
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset=“utf-8”>
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<title>Use JS Cookie</title>
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</head>
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<body>
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<script type="text/javascript">
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setCookie('userName', 'Tom', 20);
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userName = getCookie('userName');
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alert('get cookie userName: '+userName);
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result = checkCookie('userName') ? 'Yes' : 'No';
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alert('checke cookie userName is exist? '+result);
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delCookie('userName');
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alert('has deleted cookie userName');
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userName = getCookie('userName');
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alert('get cookie userName: '+userName);
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result = checkCookie('userName') ? 'Yes' : 'No';
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alert('checke cookie userName is exist?'+result);
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/**
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*设置Cookie
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*@param c_name string 要设置的cookie的名称
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*@param value mixed 要设置的cookie的值
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*@param expiredays int 设置cookie多少天后过期
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*/
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function setCookie(c_name, value, expiredays){
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var exdate = new Date();
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exdate.setDate(exdate.getDate() + expiredays);
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document.cookie = c_name+"="+escape(value)+((expiredays==null)?"":";expires="+exdate.toGMTString());
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}
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/**
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*根据Cookie名获取Cookie值
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*@param c_name string Cookie名
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*@return string
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*/
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function getCookie(c_name){
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if(document.cookie.length >0){
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c_start = document.cookie.indexOf(c_name+"=");
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if(c_start != -1){
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c_start = c_start + c_name.length + 1;
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c_end = document.cookie.indexOf(";", c_start);
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if(c_end == -1){
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c_end = document.cookie.length;
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}
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return unescape(document.cookie.substring(c_start, c_end));
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}
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}
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return "";
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}
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/**
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*删除设置的Cookie
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*@param c_name string 设置的cookie的名称
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*/
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function delCookie(c_name){
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var exp = new Date();
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exp.setTime(exp.getTime() - 1);
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var cval = getCookie(c_name);
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if(cval != null){
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document.cookie = c_name+"="+cval+";expires="+exp.toGMTString();
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}
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}
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/**
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*检查某Cookie是否存在
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*@param c_name string 设置的Cookie名称
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*@return boolean
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*/
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function checkCookie(c_name){
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var value = getCookie(c_name);
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if(value != null && value != ""){
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return true;
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}else{
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return false;
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}
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}
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</script>
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</body>
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</html>