A brief discussion on some operations of checkbox (practical experience)_Basic knowledge

Checkbox seems very simple, but sometimes it is a headache. What is difficult? Just google it and the code will come out, but is it really correct? !

Copy code The code is as follows:

1. Pass $(selector).attr("checked ")Can you get the actual value?
No, after the checkbox is selected once, the result is always checked
2. Can the checkbox be selected through $(selector).attr("checked", true)?
No, you can try

What should we do?

After experiments, the summary is as follows:

Copy the code The code is as follows:

The following obj = document.getElementById("id")
1. Get the value: $(selector).is(":checked") or $(selector).prop(":checked") returns true/false
2. Operation selection: obj.checked = true
3. Inverse selection obj.checked = !obj.checked