When override default setting of TinyMCE, why can't get the value of textarea?

Hi,
I refer the article,https://code.djangoproject.com/wiki/
AddWYSIWYGEditor, and create textareas.js to override default setting
of TinyMCE. the textarea shows new functions while creating the
textareas.js. However, when I submit the data, server can't save the
data.
if I don't override the setting, server can save the data.

How to solve this?
thanks!!

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