dojo中的on绑定事件问题

on(dojo.byId('messageManagerSearchBtn'), 'click', lang.hitch(this, messageManagerSearchBtnClick, u));

<button id="button1" class="clickMe">Click me</button>
<button id="button2" class="clickMeAlso">Click me also</button>
<button id="button3" class="clickMe">Click me too</button>
<button id="button4" class="clickMeAlso">Please click me</button>
<script>
require(["dojo/query", "dojo/_base/lang", "dojo/domReady!"],
function(query, lang) {

var myObject = {
id: "myObject",
onClick: function(evt){
alert("The scope of this handler is " + this.id);
}
};
query(".clickMe").on("click", myObject.onClick);
query(".clickMeAlso").on("click", lang.hitch(myObject, "onClick"));

});
</script>