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Vue is a popular front-end framework that is widely used to build single-page applications. It adopts data-driven thinking and realizes the binding of data and views through a responsive system. This allows us to easily modify the data while automatically updating the view. However, can all properties in Vue change in real time? This article will explore this issue.
Responsive system in Vue
Vue implements the binding of data and views through a responsive system. When we modify the data, Vue automatically recognizes and updates the view to keep it in sync with the data. In this way, we can easily implement various data-driven interactive effects without having to manually modify DOM elements.
In Vue, data objects are packaged into reactive objects, and these objects will be tracked by Vue. When the properties of the responsive object are modified, Vue will automatically notify the view to update.
Vue's responsive system mainly consists of the following three parts:
Vue uses listeners to monitor changes in data objects. When a property of the data object is modified, the listener will be notified and the corresponding operation will be triggered.
Vue uses subscribers to subscribe to changes in data objects. When a property of the data object is modified, the subscriber is notified and the view is updated.
Vue uses instructions to bind the interface to data. When the data changes, the instructions will automatically update the DOM elements according to the binding rules.
In Vue, all responsive objects are defined by the Object.defineProperty() method. This method is used to define a property, including get and set methods. When the property is read, the get method is called, and when the property is modified, the set method is called. In this way, Vue can track changes to responsive objects and perform corresponding operations.
Can all properties in Vue change in real time?
In theory, all properties in Vue should need to change in real time. Because in Vue, as long as the data changes, the responsive system will automatically update the view.
However, in practical application, we may encounter some problems. For example, if we directly modify an element of an array, Vue may not be able to detect the change correctly. Therefore, in this case, we need to manually call the Vue.set() method to notify Vue to update.
In addition, in the Vue documentation, there are also some things called "responsive considerations", such as:
Summary
All properties in Vue should be able to change in real time. This is the original intention of the Vue responsive system. But in actual applications, we may encounter some situations where we need to manually call the Vue.set() method to update. In order to avoid this situation from happening, we need to pay attention to some Vue conventions and precautions to avoid dynamically modifying the properties of the data. In this way, we can happily use Vue to develop various data-driven interactive effects.
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