Question

在vanilla JS中，我可以监听特定DOM元素的事件：el.addEventListener('click',function(){});。是否有一种与angularjs上的$ on方法相同的方法，并听取特定的范围？

Answer 1

如果你想听一个特定的范围值，我建议你使用Angular的$ method service。

以下是如何使用它的示例：

scope.$watch('name', function(newValue, oldValue) {
  scope.counter = scope.counter + 1;
});

也：

scope.$watch(
  // This function returns the value being watched. It is called for each turn of the $digest loop
  function() { return food; },
  // This is the change listener, called when the value returned from the above function changes
  function(newValue, oldValue) {
    if ( newValue !== oldValue ) {
      // Only increment the counter if the value changed
      scope.foodCounter = scope.foodCounter + 1;
    }
  }
);

听取angularjs的特定范围

1 个答案: