<!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>

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