优化javascript 远比 优化 java code 难

javascript program specification

1. if script depend on one html code directly(eg: document.getElementById('xxx')), please directly write this function under this page or a new script file if too large code

2. treat every individuate service as an object especially complex function.
eg:
Ext.namespace('Vendor');
Ext.namespace('Vendor.PrintVendor');
         Ext.namespace('Vendor.SaveVendor');
  this is especially useful for a new cr. for that your new added feature may be only available in new feature object.
  but why not treat printVendor/ saveVendor as method for vendor?
  because that printVendor need many code to implement logic. if so,  to separate it as a object, making code more clear.