微信小程序—如何获取用户输入文本框的值k.detail.value

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1、前端

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<view>
	<view>
		<textarea class="text " bindinput="change"  placeholder="请输入你想说的话......字数200字以内 "></textarea>
	</view>
	
	<button bindtap="submit" class="btn btn-success block ">提交评价</button>
</view>

2、后端js

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/**
  * 评价内容
  */
 change: function (k) {

   console.log('change');
   console.log(k.detail.value);
   var b = k.detail.value; //这里就是取得的值
   var t =this;
   t.setData({
     content:b
   })

 },
 submit: function () {
   console.log('submit');
   var t = this;
   var order_id = t.data.deviceinfo.id;
   console.log(order_id);
   var goodsid = t.data.deviceinfo.device_id;
   var storeid = t.data.deviceinfo.storeid;
   var tagids = t.data.tagids;
   var level = t.data.level;
   var content = t.data.content;
   e.get("store.order_comment", { order_id: order_id, goodsid: goodsid, storeid: storeid, tagids: tagids, level: level, content: content}, function (k) {
     0 != k.error && e.toast(t.message, "loading"),
       wx.navigateBack("/pages/shareservice/servicedetail/index")
   }, true)
 },

console打印结果