推荐一个Javascript LRU Cache 对象。

http://www.monsur.com/projects/jscache/

这个js cache不错。 功能也比较全。在项目中用它来缓存些大计算量的javascript json 对象。

[code]

Cache cache = new Cache(200);

function reloadTagCloud() {
if (startDate != null && endDate != null) {
showIndicator();
var result = null;
if (tagSource == "Directory"){
result = cache.getItem("Directory" + startDate + endDate);
}
if (result != null){
processTagResult(result);
hideIndicator();
return ;
}
jsonrpc.subscribe.getTags(getTagsCallback, startDate, endDate, tagSource, 'frequency' /*tagOrder, should sort the top 20 locally, always use frequency on server side.*/);
}
}

function getTagsCallback(result, exception) {
if (exception) {
showError("An error has occurred: " + exception.message);
} else {
if (tagSource == "Directory"){
cache.setItem("Directory" + startDate + endDate, result);
}
processTagResult(result);
}

hideIndicator();
}

function processTagResult(result){
tagCloud.viewTags = result.sort(sortByFrquency);

tagCloud.setTagFontSizes();

updatTagCloudViewByOrder();
try {
dojo.byId("tagsButton").focus();
} catch (e) {}
}[/code]