<div class="simulate-textarea"
  ng-model="view.text" contenteditable="true" placeholder="请输入内容"></div>

 /**
 * div模拟textarea输入框双向数据绑定指令
 */
 .directive('contenteditable', [function() {
 return {
  require: 'ngModel',
  link: function(scope, element, attrs, ctrl) {
  //view -> model
  element.bind('input', function() {
   scope.$apply(function() {
   ctrl.$setViewValue(element.html());
   });
  });
  //model -> view
  ctrl.$render = function() {
   element.html(ctrl.$viewValue);
  };
  }
 };
 }

.simulate-textarea {
 margin-left: 84px;
 display: inline-block;
 width: calc(100% - 84px);
 /*border: 1px solid #dddddd;*/
 min-height:20px;
 _height: 20px;
 max-height: 120px;
 /*border-radius: 4px;*/
 /*padding: 4px 6px;*/
 outline: 0;
 word-break:break-all;
 word-wrap: break-word;
 white-space: pre-wrap;
 overflow-x: hidden;
 overflow-y: auto;
 line-height: 20px;
 font-size: 12px;
}