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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