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<!DOCTYPE html> <html> <script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script> <body ng-app=""> <input ng-focus="count = count + 1" ng-init="count=0" /> <h1>{{count}}</h1> <p>此例将在输入框获得焦点时，增加变量“count”的值。</p> </body> </html>