• WXML

<form bindsubmit="submitForm">
  <text class="key">内容<text>
  <input name="title" maxlength="100" value="{{title}}" />
  <button formType="submit">提交button>
form>

• JS

submitForm:function(e){
   var title = e.detail.value.title;
   ......
   success: function (res) {
     //将title值设置空
    that.setData({
      title: ''
     }
   }
}