1.基本
<div id="example-1">
<button v-on:click="counter += 1">Add 1</button>
<p>The button above has been clicked {{ counter }} times.</p>
</div>
var example1 = new Vue({
el: '#example-1',
data: {
counter: 0
}
})
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2.绑定方法
<div id="example-2">
<!-- `greet` is the name of a method defined below -->
<button v-on:click="greet">Greet</button>
</div>
var example2 = new Vue({
el: '#example-2',
data: {
name: 'Vue.js'
},
// define methods under the `methods` object
methods: {
greet: function (event) {
// `this` inside methods points to the Vue instance
alert('Hello ' + this.name + '!')
// `event` is the native DOM event
alert(event.target.tagName)
}
}
})
// you can invoke methods in JavaScript too
example2.greet() // -> 'Hello Vue.js!'
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3.直接传参
<div id="example-3">
<button v-on:click="say('hi')">Say hi</button>
<button v-on:click="say('what')">Say what</button>
</div>
new Vue({
el: '#example-3',
methods: {
say: function (message) {
alert(message)
}
}
})
3.有时候我们需要获取event
<button v-on:click="warn('Form cannot be submitted yet.', $event)">Submit</button>
// ...
methods: {
warn: function (message, event) {
// now we have access to the native event
if (event) event.preventDefault()
alert(message)
}
}
4.event 上的方法??
.stop
.prevent
.capture
.self
<!-- the click event's propagation will be stopped -->
<a v-on:click.stop="doThis"></a>
<!-- the submit event will no longer reload the page -->
<form v-on:submit.prevent="onSubmit"></form>
<!-- modifiers can be chained -->
<a v-on:click.stop.prevent="doThat"></a>
<!-- just the modifier -->
<form v-on:submit.prevent></form>
<!-- use capture mode when adding the event listener -->
<div v-on:click.capture="doThis">...</div>
<!-- only trigger handler if event.target is the element itself -->
<!-- i.e. not from a child element -->
<div v-on:click.self="doThat">...</div>
5.键盘事件
<!-- only call vm.submit() when the keyCode is 13 -->
<input v-on:keyup.13="submit">
<!-- same as above -->
<input v-on:keyup.enter="submit">
<!-- also works for shorthand -->
<input @keyup.enter="submit">
其他属性
enter
tab
delete (captures both “Delete” and “Backspace” keys)
esc
space
up
down
left
right
也可以自己定义属性
// enable v-on:keyup.f1
Vue.config.keyCodes.f1 = 112
为什么都绑定在html元素上
It’s easier to locate the handler function implementations within your
JS code by simply skimming the HTML template.
Since you don’t have to manually attach event listeners in JS, your
ViewModel code can be pure logic and DOM-free. This makes it
easier to test.
When a ViewModel is destroyed, all event listeners are
automatically removed. You don’t need to worry about cleaning it up
yourself.
