javascript - Time triggered when checkbox is checked and unchecked

Question

$(".checkboxs_yy").click(function(){ {code...} .checkboxs_yy is a checkbox. I want it to trigger a time when it is selected, and trigger another event when it is not selected. Why did I write this This has always been unselected, how should I change it?

大家讲道理 · Answer

$(".checkboxs_yy").click(function(){
    if($(this).is(":checked")){
        console.log("选中");
    }else{
        console.log("未选中");
    }
});

巴扎黑 · Answer

$(this).is(":checked")

为情所困 · Answer

Use $(this).prop('checked') instead of $(this).attr('checked') to get dynamically variable attributes.

我想大声告诉你 · Answer

attr() is not suitable to be used to determine whether it is selected under checkbox. You can use .is(":checked") or .prop("checked", true) to determine whether it is selected.
There are relevant instructions in the jQuery API. jQuery 1.6+ needs to use prop, especially the judgment of the checked attribute of checkBox.
At the same time, .is(":checked") is suitable for all versions