javascript - 在每次 ng-click 时增加 ng-repeat 的计数

Question

step-1- Todo 值将增加每次点击对应的 todo

<li class="list-group-item" ng-repeat="todo in todos">
    <span ng-click="count = count + 1" ng-init="count=0"> value= {{count}} </span>
</li>

第 2 步 - 如何在每次点击时将“计数”和待办事项“id”放入我的函数中

问题(问题在这里)

我的代码(我知道错了)

<li class="list-group-item" ng-repeat="todo in todos">
    <span ng-click="addLike(todo._id) (count = count + 1)" ng-init="count=0"> value= {{count}} </span>
</li>

function TodoCtrl($scope) {
  $scope.todos =  [
      {text:'todo one'},
      {text:'todo two', done:false}
  ]
};

jsfiddle

Answer 1

ng-click="count=count+1; addLike(todo._id, count)"

Fiddle

Bhesh Gurung 提供 a resource了解为什么增量运算符 (++) 对我们不起作用:

Since ++points isn't a valid Angular expression, what happens? The helpful error message in the console points us in the right direction:

Error: [$parse:syntax] Syntax Error: Token '+' not a primary expression at column 2 of the expression [++points] starting at [+points]

From this message, we see that our expression used some unsupported syntax (in this case, the pre-increment operator ++). The error message is thrown by the very magical core Angular service, $parse.

还值得注意的是，每个按钮都有自己的范围，因此计数会独立增加。