http://www.ituring.com.cn/article/15764
**$watch(watchExpression, listener, objectEquality)
http://code.angularjs.org/1.2.6/docs/api/ng.$rootScope.Scope
Registers a listener callback
to be executed whenever the watchExpression changes.
Radio
<label class="radio inline">
<input type="radio" ng-model="ngrdo" value="DDNS" ng-disabled="!ngchk0">{{}}
</label>
<label class="radio inline">
<input type="radio" ng-mod......
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