JS常用代码

JS – cookie// name: cookie唯一的名称 cookie必须经过URL编码 不区分大小写 实践中最好当作cookie区分大小写// value: 字符串值 必须经过URL编码// expires: 失效时间 cookie何时被删除的时间戳 默认情况下会话结束立即将所有cookie删除// path: 域 所有向该域的请求中都会包含cookie 可以包含子域名 也可以不包含// domain: 路径 对于指定域中的那个路径 应该向服务器发送cookie// secure: 安全标志 指定后，cookie只有在使用SSL连接时才会发送到服务器 是cookie中唯一一个非名值对的，直接包含securevar cookieUtil = { get: function(name) { var cookieName = encodeURIComponent(name) + “=”, cookieStart = document.cookie.indexOf(cookieName), cookieValue = null; if(cookieStart > -1) { var cookieEnd = document.cookie.indexOf(’;’, cookieStart); if(cookieEnd === -1) { cookieEnd = document.cookie.length; } cookieValue = decodeURIComponent(document.cookie.substring(cookieStart+cookieName.length, cookieEnd)); } return cookieValue; }, set: function(name, value, expires, path, domain, secure) { var cookieText = encodeURIComponent(name)+’=’+encodeURIComponent(value); if(expires instanceof Date) { cookieText += ‘; expires=’ + expires.toGMTString(); } else if(typeof expires === ’number’) { cookieText += ‘; expires=’ + (new Date(expires2460601000+Date.now())).toGMTString(); } // (new Date(毫秒数)).toGMTString() // 7天后 (new Date(72460601000+Date.now())).toGMTString() if(path) { cookieText += ‘; path=’ + path; } if(domain) { cookieText += ‘; domain=’ + domain; } if(secure) { cookieText += ‘; secure’; } document.cookie = cookieText; }, unset: function(name, path, domain, secure) { this.set(name, ‘’, new Date(0), path, domain, secure); }}