Exclusive thinking of JS

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In the JS learned today, to achieve the tba column switching effect, the exclusive thinking is used.

When the user clicks the button, not only the background color of the button will change, but the content below will also change accordingly.

First of all, you need to implement the change of button, use a for loop to traverse each button, and initialize all buttons so that their class names are empty; Then break out of the loop and assign a class to the currently clicked button.

For each box below to change with different buttons, you must first get the serial number of each button and match each one. , so that they correspond to each other.

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