<div ng-app="myApp" ng-controller="myCtrl">
  名字: <input ng-model="name">
 <h1>你输入了: {{name}}</h1>
</div>

<div class="wrap">
    <textarea></textarea>
    <div class="miss"></div>
 </div>

 $('textarea').on('input propertychange', function() {
   $('.miss').html($(this).val().length + "~"+$(this).val());
 });

var txt = document.querySelector("textarea"),
    msg = document.querySelector(".miss");
  //不兼容IE8 以下
  txt.addEventListener("input",function () {
    msg.innerHTML = this.value + "~"+this.value.length;
  },false)