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Explain in detail how to use this.$emit in vue.js
- 亚连Original
- 2018-06-05 11:20:0510496browse
Below I will share with you an in-depth understanding of this.$emit in vue.js. It has a good reference value and I hope it will be helpful to everyone.
Understanding of this.emit in vue.js: this.emit('increment1', "This position can add parameters"); in fact, its function is to trigger a custom function.
Look at the example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<script src="vue.js"></script>
<body>
<p id="counter-event-example">
<p>{{ total }}</p>
<button-counter v-on:increment1="incrementTotal1"></button-counter>
<button-counter v-on:increment2="incrementTotal2"></button-counter>
</p>
</body>
<script>
Vue.component('button-counter', {
template: '<button v-on:click="increment">{{ counter }}</button>',
data: function () {
return {
counter: 0
}
},
methods: {
increment: function () {
this.counter += 1;
this.$emit('increment1',"这个位子是可以加参数的");//触发自定义increment1的函数。此处的increment1函数就是 incrementTotal1函数。
// this.$emit('increment2'); //此时不会触发自定义increment2的函数。
}
}
});
new Vue({
el: '#counter-event-example',
data: {
total: 0
},
methods: {
incrementTotal1: function (e) {
this.total += 1;
console.log(e);
},
incrementTotal2: function () {
this.total += 1;
}
}
})
</script>
</html>Further analyze the above example:
1. First look at the custom component button-counter and bind the method: increment;
2. When the button is clicked, the function increment will be executed, and there is this.$emit(' increment1',"This position can add parameters");
3. When increment is executed, the custom function increment1, which is the incrementTotal1 function, will be triggered;
4. And increment The custom function increment2 is not triggered during execution, so clicking the second button does not execute the incrementTotal2 function.
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
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