Off jquery Judging whether the input type= "checkbox" element is selected

In the use of the check box, you want to be in JS to determine whether Chekbox is selected

<input name= "Ispermit" id= "Ispermit" type= "checkbox" >

Baidu has a lot of judgment method

1.

if ($ ("#isPermit"). attr ("checked") = = "Checked")

2.

if ($ ("#isPermit"). attr ("checked") ==true)

3.

if ($ ("#isPermit"). Is ("checked"))

Wait, these methods are tested are not valid, do not know is not because of the version of jquery, tested this method is effective

if ($ ("#isPermit"). Is (": Checked"))

Here to record, I hope that the research in-depth people see the message.

Off jquery Judging whether the input type= "checkbox" element is selected