<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://unpkg.com/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<p>{{ message }}</p>
<p>{{ count }}</p>
<button v-on:click="add">+</button>
<button @click="sub">-</button>
</div>
<script>
new Vue({
el: '#app',
data: {
message: 'Hello Vue.js!',
count: 0
},
methods: {
add: function() {
this.count++;
console.log("add " + this.count)
},
sub: function() {
this.count--;
console.log("sub " + this.count)
},
}
})
</script>
</body>
</html>
