What are the instruction modifiers in vue?

Vue instruction modifiers can be used to customize instruction behavior, including: delayed instruction execution (.lazy) two-way data binding (.sync) one-time instruction execution (.once) instruction calculation result cache (.memo) Prevent element default behavior (.prevent) Prevent events from bubbling (.stop) Listen for events during the capture phase (.capture) Trigger events only on the element itself (.self) Specify specific mouse buttons to trigger events (.left/.middle/ .right)

Vue directive modifier

The directive modifier is a suffix added to the end of the directive for Modify the behavior of instructions. Vue provides a variety of directive modifiers, which can be used to meet different needs.

Common Vue directive modifiers

• .lazy: Delay execution of the directive until the element is added to the DOM.
• .sync: Two-way binding of directive-bound data to a property that can be accessed by the parent component.
• .once: The instruction is executed only once, when the component is initialized.
• .memo: Cache the calculation results of instructions to prevent repeated calculations.
• .prevent: Prevents the default behavior when an event is fired on an element.
• .stop: Stops event bubbling when the event is triggered on the element.
• .capture: Listen for events during the capture phase, not the bubbling phase.
• .self: Trigger the event only on the element on which the directive is applied, ignoring child elements.
• .left: The command is only triggered when the left mouse button is clicked.
• .middle: The command is only triggered when the middle mouse button is clicked.
• .right: The command is only triggered when the right mouse button is clicked.

Using directive modifiers

The directive modifier is added after the directive name and separated by a period. For example:

<button v-on:click.prevent>按钮</button>

In this example, the .prevent modifier tells Vue to prevent the default behavior when the click event is fired on the element.

Extended Usage

In addition to these common modifiers, Vue also allows the creation of custom directive modifiers. This provides the flexibility to fine-tune the behavior of the directive as needed.

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