<!DOCTYPE html>
<html lang="zh">
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<link href="../css/style.css" rel="stylesheet"> </head>
<body>
<div id="myApp">
<h1>用户注册</h1>
<div>
<label for="username">用户：</label>
<input type="text" id="username" v-model.lazy="username" @change="checkUsername">
<span v-if="checkUsernameOK">可注册</span>
</div>
<div>
<label for="age">年龄：</label>
<input type="number" id="age" v-model.number="age">
</div>
<div>
<label for="content">个人简介：</label><br/>
<textarea id="content" v-model.trim="content" cols="55" rows="8"></textarea>
</div>
<h4>信息区</h4>
<p>{{username}}</p>
<p>{{age}}</p>
<p><pre>{{content}}</pre></p>
</div>
<script>
var myApp = new Vue({
el: '#myApp',
data: {
username: "",
checkUsernameOK: false,
age: "",
content: "",
},
methods: {
checkUsername: function(){
if (this.username.length > 0) this.checkUsernameOK = true;
else this.checkUsernameOK = false;
},
},
});
</script>
</body>
</html>