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This article mainly introduces javascript how to determine whether the element has focus, the article is very detailed, has a certain reference value, interested friends must read!

In JavaScript, onfocus() and onblur() events can be used to determine whether an element has focus. The onfocus event occurs when the element acquires focus, and the onblur event occurs when the element loses focus. The syntax is "

In JavaScript:

object.onblur=function(){SomeJavaScriptCode};

Examples are as follows:

newbie tutorial (runoob.com)function(){document.getElementById ('tip ')[xss_clean]=' element loses focus';}function myFunction(x){document.getElementById ('tip ')[xss_clean]=' element gains focus';} Example of determining focus:

Output:

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