<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UFT-8">
<title>
vue
</title>
<script src="https://cdn.bootcss.com/vue/2.6.11/vue.min.js"></script>
</head>
<!--
計算屬性: computed
偵聽器: watch
使用場景: watch(異步場景) computed(數據聯動)
-->
<body>
<div id="app">
{{msg}}
<p>
{{msg1}}
</p>
</div>
<script>
var arr = 'new test'
// 將vue賦值給一個變量就可以在控制檯調試vue
var app = new Vue({
el: '#app',
data: {
msg: 'hello vue!',
another: 'another Hello Vue!'
},
methods: {
},
watch: {
msg: function (newval, oldval) {
console.log('newval is ' + newval)
console.log('oldval is ' + oldval)
}
},
computed: {
msg1: function () {
// 由 msg + another 組成的 msg1 在 vue實例中任意一個值變化 都會影響到msg1
return 'computed:' + this.msg + ',' + this.another + arr
}
},
})
</script>
</body>
</html>
