加载node模块

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var mod = require('module');
 
module.exports = function module_exist(name){
  /**
   * This is UGLY but since we're not allowed to require 'native_module'
   * this is the only way to test if a native module (or non-native module) exist.
   */
  try{
    require(name);
  } catch(err){
    if(err.code === 'MODULE_NOT_FOUND'){
      return false;
    }
  }
 
  return true;
};