Onfocus event, onblur event, Focus () method, Blur () method, onfocusonblur

Onfocus event, onblur event, Focus () method, Blur () method, onfocusonblur

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<Pre name = "code" class = "html"> <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 











Onblur and onfocus usage
Onblur is triggered when the control loses focus.
Onfocus is the opposite. It is triggered when the focus is obtained.

Example
Www.w3school.com.cn/htmldom/event_onblur.asp
Www.w3school.com.cn/htmldom/event_onfocus.asp

Both the onFocus and onBlur events are difficult to implement.
Add an id to this element,
Var ele = document. getElementById ("id ");
Ele. onfocus = function () {alert (1 )};
Ele. onblur = function () {alert (2 )};