Hello,
    I use the renderJavascript(java.lang.CharSequence javascript,
java.lang.String id) method in  HeaderResponse class to output the some js
code in html header. This renderJavascript method will render javascript
code to the response, if the javascript has not already been rendered. But
i want to override  if the javascript has already been rendered. How can i
make it? Thank you.  BTW, excuse my poor English.

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