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In idea development, what is the small ball of this interface page for?

2022-01-26 23:37:13 CSDN Q & A

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controller This little thing will appear on the rubbed interface , What does he do? ?
What's the function ?




Refer to the answer 1:

Put the mouse up to see what prompt , Like this, the mouse stays on it

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Refer to the answer 2:

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