How to use fcous in javascript

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In javascript, focus means "focus" and is a built-in function of the DOM element object to set the focus for the element, with the syntax format "HTMLElementObject.focus ()".

In javascript, focus means "focus", which means the area of attention, that is, the location where the current cursor is activated, and the small vertical bar that flashes on the page screen, indicating that a control on the web page is selected and can be manipulated. Click the mouse to get the cursor, and the Tab key can switch focus according to the set Tabindex.

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 the focus of the area. Whether the area (Activity interface, controls, etc.) works and responds depends on whether it gains focus or not.

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

The focus () method is used to set the focus for the element, if it can be set.

The syntax format of the focus () method

HTMLElementObject.focus ()

Example:

Function setFocus () {document.getElementById ('check1') .focus ()} function loseFocus () {document.getElementById (' check1') .blur ()}

Effect picture:

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