clearing input placeholder in iOS5

问题

I noticed that in iOS5, input placeholder text doesn't clear automatically on focus.

I tried this jquery function but it's not working:

$('input[type="number"]').focus(function(){
$('this').attr('placeholder','');
});

回答1:

It looks to me the problem lies here

$('this').attr('placeholder','');

Try replacing:

$('this')

With

$(this)

来源：https://stackoverflow.com/questions/8282348/clearing-input-placeholder-in-ios5