<textarea placeholder="请输入理由/提出宝贵的建议" maxlength="{{max}}" bindinput="getopinion"></textarea>
<view class="limit">{{min}}/100</view>
data: {
min: 0,
max: 100,
},
getopinion(e) {
var value = e.detail.value;
var len = e.detail.cursor;;
this.setData({
min: len
});
},