代码
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<!DOCTYPE html>
<html lang="en" style="background-color: #ccc;">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body style="background-color: #ccc;">
<div id="app">
<div>商品名称：<input v-model="name"/></div>
<button v-on:click="cut">减一个</button>
购买数量{{count}}
<button v-on:click="add">加一个</button>
<button v-on:click="addCart">加入购物车</button>
<div v-for="(item, index) in list" :key="index">
{{item.name}} x{{item.count}}
</div>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script type="text/javascript">
var vm = new Vue({
el: '#app',
data: {
name: '',
count:0,
isMax: false,
list: []
},
methods: {
cut() {
this.count = this.count - 1
this.isMax = false
},
add() {
this.count = this.count + 1
},
addCart() {
this.list.push({
name: this.name,
count: this.count
})
}
},
watch: {
count: function(newVal, oldVal) {
if(newVal > 10) {
this.isMax = true
}
if(newVal < 0) {
this.count = 0
}
},
name: function() {
this.count = 0
this.isMax = false
},
isMax: function(newVal) {
if (newVal) {
console.log('注意：您购买的数量较大，请确认是否操作有误')
}
},
list() {
console.log('购物车数据发生改变')
}
}
})
</script>
</html>
运行结果