小程序实现textarea随输入的文字行数变化高度自…

<view class="text-box">
      <text>{{currentInput}}</text>
      <textarea class="weui-textarea" placeholder="请输入文本" bindinput="getInput" maxlength="1000"/>
</view>

.text-box{
    width:100%; 
    position: relative;
    min-height:80rpx;
　  margin-top:17rpx;
}
.text-box text{
   display:block;
   visibility:hidden;
   word-break:break-all;
   word-wrap:break-word;
}
.text-box .weui-textarea{
    height:100%;
    position: absolute;
    left:0;
    top:0;　
    overflow-y:hidden;
    word-break:break-all;
    word-wrap:break-word;
}

Page({
  data: {
    currentInput:''
  },
  getInput:function(e){
    this.setData({
      currentInput: e.detail.value
    })
  }
})