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Step 2 Add an HTML div to a blank page and insert several input buttons into the div. Ten of these buttons stand for number 0 to number 9 and the last button stands for the Backspace button. Set the onclick events of the ten number buttons to input() function, and then set the parameter of the input() function to this. Additionally, set the onclick event of the Backspace button to del() function. Step 3 Create the input(e) and del() JavaScript functions on the page. The input(e) function enters the number into the text box by using the parameter e. The del() function deletes a number from the text box.