错误写法
data: {
msg: 'hello world'
}
data必须是一个函数
<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="/vue2.js"></script>
</head>
<body>
<template id='dan'>
<div>{{msg}}<button @click='add'>点击</button>
</div>
</template>
<div id="app">
<index-a></index-a>
</div>
<script>
Vue.component('indexA', {
template: '#dan',
data() {
return {
msg: "3333"
}
},
methods: {
add() {
this.msg = '555'
}
}
})
var vm = new Vue({
el: '#app',
data: {
}
})
</script>
</body>
</html>