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<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<div id="app">
<input v-model="val"/>
<button v-for="num in 9" :key="num" @click="val = num">
{{num}}
</button>
<button @click="next">next</button>
</div>
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new Vue({
el:'#app',
data:{
val:''
},
methods:{
next(){
if(!this.val){
alert('不能为空')
}else{
alert('正确')
}
});
输入 CSS 代码……