How to add attributes to variables in data in vue
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Adding attributes to variables in data the vue framework uses mvvm mode
There is a notification mechanism that will be updated through the view if the data changes.
Is that so? as long as we change the value in data in vue, the dom tree will be updated at any time.
{{val}} add a new attribute var app=new Vue ({el: "# app", data: {test: {"a": 'test.a' }) console.log (app.test.a) / / access to app.test.a= "test.b"; console.log (app.test.a); / / print out test.b while the view has changed
It is possible for us to access variables outside the instance of vue.
You can access the printed test.a directly from app.test.a.
What if we just change it here?
App.test.a= "test.b"
You will find that the view has changed.
But if we add attributes to app.test here and see if it's okay.
App.test.b= "test.c"; console.log (app.test.b)
Finally, it is found that test.c is indeed added to the page, which is the power of vue responsive data.
So let's try to see if direct assignment can add attributes from the vue instance.
Methods: {add:function () {this.test.b= "test.c"; console.log (this.test);}}
I created a button on the interface and added an add method to see if I could add new properties through method calls.
The print does appear in the data data of vue, but it is not actually updated in the view.
Students who know about vue may know that data two-way binding of vue combines subscribers through data hijacking-- the popular point of the publisher is that the attribute that we added directly later is not in the notification mechanism of vue, so we can't enjoy the real-time monitoring mechanism.
But at work, we may need to add some data to our network and let it and the view update in real time.
I won't talk more nonsense and go straight to the method.
1. Operate through an array
This.test.push ({isActive:fasle})
two。 Through the global api $set
This.$set (this.test, "isActive", fasle)
3. Through Object.assign ()
This.test=Object.assign ({}, this.test, {"b": "test.c"})
The first method is that I can add it myself and can use it under special circumstances in No. 1 Middle School.
Dynamically add attributes to responsive objects in data
Data responsive object dynamically add attributes
Name: {{peple.name}} Click to add gender gender: {{peple.sex}} export default {data () {return {peple: {name: "grow up"}};}, methods: {setSex () {this.$set (this.peple, "sex", "male");}
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