使用watch来监听，如果是监听对象内属性，就要设置deep=true，如果想要开始的时候就执行设置 immediate: true，完整代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div id="app">
<div>
<p>FullName: {{fullName}}</p>
<p>FirstName: <input type="text" v-model="firstName"></p>
<p>obj.a: {{obj.a}}</p>
<p>obj.a: <input type="text" v-model="obj.a"></p>
</div>
</div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/vue.2.2.min.js"></script>
<script>
new Vue({
el: '#app',
data: {
firstName: 'Dawei',
lastName: 'Lou',
fullName: '',
obj: {
a: 123
}
},
watch: {
firstName(newName, oldName) {
this.fullName = newName + ' ' + this.lastName;
immediate: true,
},
obj: {
handler(newName, oldName) {
console.log('obj.a changed');
},
immediate: true,
deep: true
}
}
})
</script>
</body>
</html>
网友回复
我知道答案，我要回答
私活外包
