Uniapp modifies array properties, and the view is not updated

principle ： The reason why the view is not updated , Because there is no corresponding attribute defined in the array , The solution is to define attributes for the array ,uniapp And vue equally , It is not supported to dynamically add attributes to an object after the instance is created , If you want to dynamically add object attributes , Then it is not possible to use the conventional method , Only by special means , such as this.$set

One ：this.$forceUpdate(); Force update （ Golden finger , Invincible plug-in , Refresh the entire page ）

that.msg.MediaList[that.audioId].currentTime = '00:00';
that.$forceUpdate();

Two ：this.$set()

_this.$set(_this.msg.MediaList[index], 'currentTime', '00:00');