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【JS】客户端缓存相关函数封装

作者:Leon_Sine / 发布于2014/12/13/ 574

客户端缓存主要依赖于html5 特性localStorage 老浏览会使用cookie


	function getCookie(name){
	 var ret = new RegExp('(?:^|[^;])' + name + '=([^;]+)').exec(document.cookie);
	 return ret ? decodeURIComponent(ret[1]) : '';
	 }
	
	 function setCookie(name, value, expir){
	 var cookie = name + '=' + encodeURIComponent(value);
	 if(expir !== void 0){
	 var now = new Date();
	 now.setDate(now.getDate() + ~~expir);
	 cookie += '; expires=' + now.toGMTString();
	 }
	 document.cookie = cookie;
	 }
	
	 function delCookie(name){
	 var exp = new Date();
	 exp.setTime(exp.getTime() - 1);
	 var cval=getCookie(name);
	 if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
	 }
	 /**
	 * 得到缓存
	 * @param cacheName
	 */
	 function getCache(cacheName){
	 var cacheValue = '';
	 if(localStorage){
	 cacheValue = localStorage.getItem(cacheName);
	 }else if(document.cookie){
	 cacheValue = getCookie(cacheName);
	 }
	 return cacheValue;
	 }
	
	
	 /**
	 * 清除缓存
	 * @param cacheName
	 */
	 function cleanCache(cacheName){
	 var cacheValue = '';
	 if(localStorage){
	 cacheValue = localStorage.removeItem(cacheName);
	 }else if(document.cookie){
	 cacheValue = getCookie(cacheName); //删除cookie
	 delCookie(cacheValue);
	 }
	 return cacheValue;
	 }
	
	 /**
	 * 清除所有缓存
	 * @param cacheName
	 */
	 function cleanAllCache(){
	 if(localStorage){
	 localStorage.clear();
	 }else if(document.cookie){
	 //清空cookie
	 var keys=document.cookie.match(/[^ =;]+(?=\=)/g);
	 if (keys) {
	 for (var i = keys.length; i--;)
	 document.cookie=keys[i]+'=0;expires=' + new Date( 0).toUTCString();
	 }
	 }
	 }

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