代码
提交代码
<!DOCTYPE html>
<html lang="en">
<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>
<div id="app">
<div>商品名称：<input v-model="name"/></div>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
name: '方便面'
},
watch: {
name: {
handler(newVal, oldVal) {
console.log(newVal)
},
// 代表在wacth里声明了name这个方法之后立即先去执行一次handler方法
immediate: true
}
}
})
</script>
</html>
运行结果