自定义事件解决重复请求BUG的问题

define('wq.getData', function (require, exports, module) {
  var ls = require('loadJs');
   
  var cache = {};
  cache.init = function(cb,cbName,url){
    if(!cache[cbName]){
      cache[cbName] = {};
      cache[cbName].state = 'init';
      cache[cbName].cbs = [];
      cache[cbName].data = [];
    }
    cache.on(cb,cbName,url);
  }
  cache.on = function(cb,cbName,url){
    if(cache[cbName].state == 'loaded'){
      cb(cache[cbName].data)
    }else if(cache[cbName].state == 'loading'){
      cache[cbName].cbs.push(cb)
    }else if(cache[cbName].state == 'init'){
      cache[cbName].cbs.push(cb);
      cache[cbName].state = 'loading';
      cache.fetch(cb,cbName,url);
    }
  }
  cache.broadcast = function(cbName){
    cache[cbName].cbs.forEach(function(cb){
      cb(cache[cbName].data)
    });
  }
  cache.checkLoaded = function(cbName){
    if(cache[cbName].data[0]){
      cache[cbName].state = 'loaded';
      cache.broadcast(cbName);
    }
  }
  cache.fetch = function(cb,cbName,url){
    ls.loadScript({
      url: url,
      charset: 'utf-8',
      handleError:function(func, args, context,errorObj){
        console.log(_errlogText +　context);
        cache[cbName].data[0] = {};
        cache.checkLoaded(cbName);
      }
    });
    if(window.cbName) return;
    window[cbName] = function(json){
      cache[cbName].data[0] = json;
      cache.checkLoaded(cbName);
    }
  }
 
  exports.getData = function(cb,cbName,url){
    cache.init(cb,cbName,url);
  } 
 
})