angularjs 如何找子级元素，如下代码没有fing方法，求指教！
<div class="jmhYjxDZ" ng-click="jmhYjbDz($event)"><img src="../common/imgs/dz-n.png"><div class="czText">赞</div></div>$scope.jmhYjbDz = function (obj){
// obj.target.setAttribute("src","../common/imgs/dz-y.png")
alert(obj.target.find("img"));
}
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