常用代码 - 操作cookie ¶

• 作者：KK

• 发表日期：2016.12.6

我也是从别处拷来的，这是一个独立无任何其它类库依赖的函数，你可以直接粘贴到项目中，或整合到你的工具类库中使用，使用示例在下面

function cookie(name, value, options) {
	if (typeof value != 'undefined') { // name and value given, set cookie
		options = options || {};
		if (value === null) {
			value = '';
			options.expires = -1;
		}
		var expires = '';
		if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
			var date;
			if (typeof options.expires == 'number') {
				date = new Date();
				date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
			} else {
				date = options.expires;
			}
			expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
		}
		// CAUTION: Needed to parenthesize options.path and options.domain
		// in the following expressions, otherwise they evaluate to undefined
		// in the packed version for some reason...
		var path = options.path ? '; path=' + (options.path) : '';
		var domain = options.domain ? '; domain=' + (options.domain) : '';
		var secure = options.secure ? '; secure' : '';
		document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
	} else { // only name given, get cookie
		var cookieValue = null;
		if (document.cookie && document.cookie != '') {
			var cookies = document.cookie.split(';');
			for (var i = 0; i < cookies.length; i++) {
				var cookie = jQuery.trim(cookies[i]);
				// Does this cookie string begin with the name we want?
				if (cookie.substring(0, name.length + 1) == (name + '=')) {
					cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
					break;
				}
			}
		}
		return cookieValue;
	}
}

使用例子：

//设置cookie
cookie('key1', 'val1');

//读cookie
console.log('key1');  // val1

//删除cookie
cookie('key1', null);
console.log('key1');  // null


//指定过期时间为7天后和其它选项
var date = new Date();
date.setDate(date.getDate() + 7);
cookie('key2', 'val2', {
	expires : date,	//也可以是一个数字的unix时间戳
	domain : document.domain, //指定有效域名
	path : '/user'	// 指定有效目录
});