<div id="app">
{{ arr }}
<button @click="len">點我</button>
<button @click="len">增加</button>
</div>var vm = new Vue({
el: '#app',
data:{
arr: [1, 2, 3]
},
methods: {
len() {
this.arr.length = '2'
console.log(this);
},
add() {
this.arr[4] = 4;
console.log(this);
}
}
})
External CSS
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