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how to remove text from canvas in javascript

 
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my problem is that when i am clicking on button, callfunction() method called and counter is incremented by 5, when i am again click counter incremented by 5 and displayed 10 on given location my problem is that when counter is incremented previous number is not erased and displayed incremented number on previous number.I want to remove previous number and display next incremented number. i have following code
 
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You can clear the canvas before refilling it with

 
pravin rasal
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thank you so much
 
Consider Paul's rocket mass heater.
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