vue3——自己实现计数功能组件封装
<template>
<div class="my-numbox">
<div class="label">
<slot>数量</slot>
</div>
<div class="numbox">
<a href="javascript:;" @click="toggle(-1)" :class="{notallow: modelValue === 1}">-</a>
<input type="text" readonly :value="num">
<a href="javascript:;" @click="toggle(1)" :class="{notallow: modelValue === inventory}">+</a>
</div>
</div>
</template>
<script>
import { useVModel } from '@vueuse/core'
export default {
name: 'MyNumbox',
props: {
modelValue: {
type: Number,
default: 1
},
inventory: {
type: Number,
required: true
}
},
setup (props, { emit }) {
// 基于第三方的方法控制数据的双向绑定
const num = useVModel(props, 'modelValue', emit)
// 控制商品数据的变更操作
const toggle = (n) => {
if (n < 0) {
// 减一操作
if ( > 1) {
-= 1
}
} else {
// 加一操作
if ( < ) {
+= 1
}
}
}
return { num, toggle }
}
}
</script>
<style scoped lang="less">
.my-numbox {
display: flex;
align-items: center;
.notallow {
cursor: not-allowed;
}
.label {
width: 60px;
color: #999;
padding-left: 10px;
}
.numbox {
width: 120px;
height: 30px;
border: 1px solid #e4e4e4;
display: flex;
> a {
width: 29px;
line-height: 28px;
text-align: center;
text-decoration: none;
background: #f8f8f8;
font-size: 16px;
color: #666;
&:first-of-type {
border-right:1px solid #e4e4e4;
}
&:last-of-type {
border-left:1px solid #e4e4e4;
}
}
> input {
width: 60px;
padding: 0 5px;
text-align: center;
color: #666;
}
}
}
</style>