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/* ======================================== LRU 最近最少使用 ======================================== */
function
LRUCache(limit){
limit = limit||10;
var
_store = [];
var
index = {};
this
.get =
function
(key){
var
ind = index[key];
if
(_store[ind]==
null
){
// 未命中
return
null
;
}
var
newArr = _store.splice(0,ind+1);
var
result = newArr.pop();
_store = newArr.concat(_store);
_store.unshift(result);
for
(
var
k
in
index){
var
i = index[k];
if
(i==ind){
index[k] = 0;
}
else
if
(i<ind){
index[k] = ++index[k];
}
}
return
result;
};
this
.set =
function
(key,value){
if
(_store.length>=limit){
_store.pop();
}
for
(
var
k
in
index){
index[k] = index[k]+1;
}
_store.unshift(value);
index[key] = 0;;
};
this
.list =
function
(){
console.log(_store);
};
}
|
本文转自 antlove 51CTO博客,原文链接:http://blog.51cto.com/antlove/1978115