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You should look like this

$(document).bind("click",function(e){ 
    //通過(guò)e.target判斷
} 

e.target != "You click on the element that needs to be displayed" then execute hide()

$("#a").on("click", function(e){

if($(".class").is(":hidden")){
    $(".class").show();
}else{
    $(".class").hide();
}

$(document).one("click", function(){
    $(".class").hide();
});

e.stopPropagation();

});
$(".class").on("click", function(e){

e.stopPropagation();

});

There is no problem with this answer, it is quite correct