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资源说明：Smooth, throttle, queue async function parallel execution with a limitation.
Smooth.js
====
module(limitation, max_queue, timeout)
----
* limitation - default 10
* max_queue if the queue size big than max_queue, will show an warn message.
* timeout in ms - default 5000ms
```js
var limit = 5;
var smooth = require('smooth')(limit);
```
smooth(fn, [limit, [max_queue, [timeout]]])
----
smooth a function
```js
foo = smooth(foo);
```
smooth a method of class.
```js
RedisClient.prototype.get = smooth(RedisClient.prototype.get);
```
smooth a method of object.
```js
redisClient.get = smooth(redisClient.get)
```
work with async.js
----
Without smooth
```js
async.map(keys, function(key, callback) {
memcacheClient.get('ITEM_' + key, callback);
}, callback);
```
With smooth
```js
async.map(keys, smooth(function(key, callback){
memcacheClient.get('ITEM_' + key, callback);
}), callback);
```
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