想实现的效果如上图

wxml:

  <view class='suggest_title'>请输入你想反馈的问题</view><view class='suggest_box'><textarea class='suggest_text' bindinput="bindText" maxlength='200' placeholder='我们有什么地方让您不满意，请输入您的反馈意见' placeholder-class='sug_p'></textarea><text>{{t_length}}/200</text> </view>

js:

 

  data: {t_length:0,},bindText: function (e) {var t_text = e.detail.value.length;// console.log(t_text)this.setData({t_length: t_text}) },