js 实现简单缓存

var cache = {
	obj : {
		"key" : "value",//sample:"001":"lily"
	}

}
var app = {
	updateCache : function(id) {
		var onSuccess = function() {
			cache.obj[id] = "your_new_value"//save new id,new value
		}
		if (cache.obj[id] === undefined) {
			$.ajax({
				success : onSuccess
			})
		} else {
			alert("get cache data:"+cache.obj[id]);
		}

	}
}

$(app.updateCache("200"));