CTLELE/script/cache.js

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/**
*缓存在文件系统中
*/
(function(window) {
var u = {};
var cache_key = "APP_CACHAE";
/**
* 存入缓存
* true: 开启同步
* false: 异步
*/
u.put = function(key, value, sync) {
var caches = {};
if (sync == "undefined" ? false : sync) {
//同步返回结果:
var caches_str = api.getPrefs({
sync: true,
key: cache_key
});
if(caches_str){
caches = JSON.parse(caches_str);
}
caches[key] = value;
api.setPrefs({
key: cache_key,
value: caches
});
}else {
api.getPrefs({
key: cache_key
}, function(ret, err) {
if(ret) {
var caches_str = ret.value;
if(caches_str) {
caches = JSON.parse(caches_str);
}
caches[key] = value;
api.setPrefs({
key: cache_key,
value: caches
});
} else {
console.log("存入缓存失败: " + JSON.stringify(err));
}
});
}
};
/**
* 取出缓存
* 同步请求
*/
u.get = function(key) {
//同步返回结果:
var caches_str = api.getPrefs({
sync: true,
key: cache_key
});
// console.log("type:"+typeof caches_str);
if(""==caches_str){
console.log("没有缓存");
return caches_str;
}
var caches = JSON.parse(caches_str);
var _cache = caches[key];
if(!_cache) {
_cache = "";
console.log("不存在key为["+key+"]的缓存");
} else {
// console.log("key: ["+key+"], value: "+_cache);
}
return _cache;
}
/**
* 清除指定缓存
*/
u.clear = function(key) {
console.log("清除指定缓存:"+key);
//同步返回结果:
var caches_str = api.getPrefs({
sync: true,
key: cache_key
});
if(caches_str) {
var caches = JSON.parse(caches_str);
if (caches.hasOwnProperty(key)) {
delete caches[key];
api.setPrefs({
key: cache_key,
value: caches
});
console.log("已删除["+key+"]");
}else {
console.log("无法清除key为["+key+"]的缓存因为不存在此key");
}
}
};
/**
* 清除所有缓存
*/
u.clearAll = function(){
api.setPrefs({
key: cache_key,
value: '{}'
});
console.log('清除缓存成功');
}
/**
* 打印所有缓存
*/
u.print = function(){
var caches_str = api.getPrefs({
sync: true,
key: cache_key
});
console.log(caches_str);
}
/* end */
window.$cache = u;
})(window);