angular.js - How to create a new variable in repeat item in angular?

Question

1. There are only x and y in the data. I want to create a new variable item.x_y

<p ng-repeat="item in items">
  <span> {{item.x}} </span>
  <span> {{item.y}} </span>
  <span> {{item.x_y}} </span>
</p>

2. I am still in repeat, is it possible to customize a function? item.function only operates on the data of this item

Answer 1

I usually traverse the items，给每一项加x_yattributes.
The performance is so poor, others must have a better way.

Answer 2

Why not add attributes on the server side? Don’t put too much pressure on the front end. If this attribute is only for front-end display, it can be operated without adding the attribute. {{You can write your operation logic for xy here, try not to add attributes here}}. For example, if you want to add a new value of x-y, you can write it like this:
{{item.x - item.y}}

Answer 3

Add attributes to controller