修改体重增加

src/pages/main/dialog/subMenu/MsgTip.vue

       this.predialysis.weight_before > 0 &&
       this.last_record.weight_after > 0
     ) {
-      add_weight = parseFloat(
+      this.add_weight = parseFloat(
         this.predialysis.weight_before - this.last_record.weight_after
       ).toFixed(2);
     }