Old Way (pre-1.7):
$("...").attr("onclick", "").unbind("click");
New Way (1.7+):
$("...").prop("onclick", null).off("click");
(Replace ... with the selector you need.)
// use the "[attr=value]" syntax to avoid syntax errors with special characters (like "$")
$('[id="a$id"]').prop('onclick',null).off('click');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<a id="a$id" onclick="alert('get rid of this')" href="javascript:void(0)" class="black">Qualify</a>
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…