Input input box mouse focus prompt information_javascript skills

Question as title:

When the mouse clicks into the input box (input), the input box prompt disappears. When the mouse is moved away, the input box prompt appears. As shown in the picture:

How to do it:

Copy code The code is as follows:

Pay attention to the onblur and onfocus attributes of input. There are also simple if judgments. Very convenient and practical.

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