How does jQuery determine whether a checkbox is checked? Is there any way

The content of this article is about how jQuery determines whether the check box is checked? Is there any method that has certain reference value? Friends in need can refer to it. I hope it will be helpful to you.

The function implemented here is to assign a value to the input form when the check box is checked, and clear the form value when the check box is cancelled.

Implementation source code: cyfID is the id of the check box

$("#cyfID").click(function(){ 
    var ischeck=$(this).attr("checked"); 
    if(ischeck==undefined){ 
        //清除输入框 
        alert(""); 
    }
    else{ 
        //给输入框赋值 
                 alert("qq"); 
    } 
});

The implementation principle is: when the check box is checked $(this).attr(" checked") is checked, and it is undefined when not checked.

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