What can event modifiers do in vue

Event modifiers in Vue modify its behavior by appending modifiers after the event handler name. Common modifiers include: .stop: prevents the event from bubbling. prevent: prevents the event from default behavior.capture: captures Stage processing event.self: Triggered only when the event target is the element itself.once: Triggered only when the event is triggered for the first time.passive: Improve scroll and touch event performance

The role of event modifiers in Vue

Event modifiers are a special syntax in Vue that are used to modify the behavior of event handlers. They are used by appending one or more modifiers to the event handler function name.

Common event modifiers include:

• .stop: Prevents events from bubbling up to parent elements.
• .prevent: Default behavior to prevent events (for example, prevent page jumps when clicking on the <a> tag).
• .capture: Handle events in the capture phase instead of the bubbling phase.
• .self: Event handlers are only fired when the event target is the element itself (not its children).
• .once: The event handler is only fired the first time the event fires.
• .passive: Use non-blocking callbacks for scroll and touch events to improve performance.

Example:

<code class="html"><button @click.prevent="handleClick">点击按钮</button></code>

In the above example, the .prevent modifier is used to prevent the page from refreshing when the button is clicked.

Other examples:

• To stop the event from bubbling up: @click.stop
• To be in the capture phase Handle the event: @click.capture
• To trigger the handler only when the user directly clicks on the element: @click.self
• To only fire the handler when To fire the handler the first time the event fires: @click.once
• To improve the performance of scroll and touch events: @scroll.passive

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