<!DOCTYPE html>
<html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml" xmlns:v-on="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
<div id="one">
<template v-if="loginType === 'username'">
<label>Username</label>
<input placeholder="Enter your username" key="username-input">
</template>
<template v-else>
<label>Email</label>
<input placeholder="Enter your email address" key="email-input">
</template>
<button @click="change">change</button>
</div>
<script type="text/javascript">
var vm = new Vue({
el:'#one',
data:{
loginType : 'username'
},
methods:{
change:function(){
if(this.loginType=='username'){
this.loginType='email'
}
else{
this.loginType='username'
}
}
}
})
</script>
</body>
</html>
