[GitHub] myfly150 opened a new issue #1631: Problem when trying script routing rules example in Chapter 6.33 of Dubbo user manual

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myfly150 opened a new issue #1631: Problem when trying script routing rules example in Chapter 6.33 of Dubbo user manual 
URL: https://github.com/apache/incubator-dubbo/issues/1631
 
 
   When I tried the  script routing rules example ,  the return value of the example script was always the value of "invokers".
   The example script is as follow：
   ```
   function route(invokers) {
       var result = new java.util.ArrayList(invokers.size());
       for (i = 0; i < invokers.size(); i ++) {
           if ("10.20.153.10".equals(invokers.get(i).getUrl().getHost())) {
               result.add(invokers.get(i));
           }
       }
       return result;
   } (invokers); // Indicates that the method is executed immediately
   ```
   According to the grammar of javascript, the meaning of the example script is :
   ```
   function route(invokers) { ... } ;
   
   (invokers)  // This is a single expression .The return value is always invokers.
   ```
   
   instead of 
   ```
   function route(invokers) { ... } ;
   route(invokers)
   ```
   Actually, brackets surrounding the codeblock is simple solution.
   ```
   (function route(invokers) { ... } (invokers) )
   ```
   

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