How to understand the focus in javascript

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1. In js, the focus is the area of concern, that is, the current location where the cursor is activated, and a small vertical bar flashing on the page screen, indicating that a controller of the web page is selected and can be operated.

2. Focus can be obtained through focus (), and focus can be moved away through blur ().

For example, when a text box gets focus, the characters you type on the keyboard go directly into the text box; for example, a drop-down list box gets focus, and you press the down arrow on the keyboard, and it lists the list. There are also events in the program that get focus (gotfocus ()) and lose focus (lostfocus ()), as well as the focus method for the control (setfocus ()). Making good use of focus can make your program look very human.

Get the focus, the area that can work, including the Activity interface and visual controls, etc., and enable the area to automatically perform certain actions (such as scrolling and animation) or the occurrence of a logical event; it can also manually perform click events and operations to get focus. Whether the area (Activity interface, controls, etc.) works and responds depends on whether it gains focus or not.

Methods for JavaScript to get focus and move focus away:

JavaScript can get the focus through the focus () method and move the focus away by the blur () method.

Get focus:

The focus () method is used to give focus to the checkbox.

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