Test

test1

HTML

<div ng-app="MyApp">
  <div ng-controller="MyController">
    <input ng-model="to" type="email" placeholder="Recipient" />
    <textarea ng-model="emailBody"></textarea>
    <pre>{{ previewText }}</pre>
  </div>
</div>

JavaScript

angular.module('MyApp', [])
  .controller('MyController', function($scope, $interpolate) {
      // 设置监听
      $scope.$watch('emailBody', function(body) {
      console.log(body);
          if (body) {
            var template = $interpolate(body);
            $scope.previewText =
              template({
                to: $scope.to
              })
          }
        })
      })