js method to determine whether checkbox is selected_Basic knowledge

Core tip: On many occasions, you may encounter the problem of determining whether an element on the page is selected. The following is a method of using js to determine whether a CheckBox is selected.
//No number selected

Copy code The code is as follows:

< input type="checkbox" name="checkbox1" checked>

//No one selected

Copy code The code is as follows:

//No number selected

Copy code The code is as follows:

//No one selected

Copy code The code is as follows:

< input type="checkbox" name="test">