What are the shortcut keys automatically created by Vue?

The shortcut key automatically created by Vue is v-model. This shortcut key can two-way bind the form input elements (input, textarea, select, etc.) to the data in the Vue instance, so that when the value of the form changes, the data in the Vue instance will also be updated, and vice versa.

In the Vue 2.x version, we can use the v-model directive to implement two-way binding. This directive is followed by an expression, which can be a variable or a calculated property. value calculated using the method.

For example, we can define a data attribute named message in the Vue instance and use v-model in the template to bind it to an input element:

<template>
  <div>
    <input v-model="message" type="text">
    <p>Message is: {{ message }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: ''
    }
  }
}
</script>

Above In the code, we create an input element and bind it to the message data property in the Vue instance. At this time, when you enter text in the input box, the value of the message will also change accordingly, and the content displayed in the template will also be updated accordingly.

Vue also provides some modifiers to extend the functionality of v-model. For example, we can use the .lazy modifier to let the v-model directive update the bound data after the input element loses focus; use the .number modifier to automatically convert the value entered by the user into a numeric type; use the .trim modifier It can automatically remove spaces at both ends of user input values.

In addition, in the Vue 3.x version, due to the abolition of the syntax sugar of instructions such as v-bind and v-on, v-model has also been optimized simultaneously. Specifically, we can use v-model:xxx or v-bind:xxx to bind props or attributes in components, for example:

<template>
  <MyComponent v-bind:title="pageTitle" v-model:text="pageText" />
</template>

And There is no need to use v-bind and v-on respectively as in the Vue2.x version.

In short, v-model can be said to be a very important feature in the Vue framework, which very conveniently implements two-way binding between forms and data.

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