vue快速上手
2019-12-28 本文已影响0人
王哈哈就很棒
1.数据双向绑定
更改数据也触发视图的相应更新
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<h1>{{msg}}</h1>
<input type="text" v-model="msg">
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
msg: 'hello world'
}
})
</script>
</body>
</html>
image.png
渲染html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<h1 v-html="msg"></h1>
<input type="text" v-model="msg">
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
msg: '<h1 style="color: red;">hello world</h1>'
}
})
</script>
</body>
</html>
image.png
v-bind
双大括号语法不能作用在 HTML 特性（标签属性）上，需要对标签属性操作，应该使用 v-bind 指令：
<!DOCTYPE html>
<html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<input type="checkbox" v-bind:checked="isChecked">
<p>num + 3 = {{num+3}}</p>
<p>ok? {{ok ? 'yes':'no'}}</p>
<p>反转名称 {{name.split('').reverse().join('')}}</p>
<p v-bind:class="'col' + colNum">test</p>
<a v-bind:href="url" target="_blank">link</a>
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
isChecked: false,
num: 23,
ok: true,
name: '王哈哈',
colNum: '78',
url: 'http://www.baidu.com'
}
})
</script>
</body>
</html>
image.png
v-on
<!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>
</head>
<body>
<div id="app">
<h1>{{name}}</h1>
<button v-on:click="handleDemo">click</button>
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
name: '王哈哈'
},
methods: {
handleDemo(){
this.name = this.name.split('').reverse().join('');
}
}
})
</script>
</body>
</html>
动态参数
event 此时的值为 click ，那我们点击按钮时就会触发事件回调
<!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>
</head>
<body>
<div id="app">
<h1>{{name}}</h1>
<button v-on:[event]="handleDemo">click</button>
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
name: '王哈哈',
event: 'click'
},
methods: {
handleDemo(){
this.name = this.name.split('').reverse().join('');
}
}
})
</script>
</body>
</html>
计算属性
在 Vue 中计算属性是 惰性的，只有当依赖数据发生改变时，才会触发计算，否则，它的值是上一次触发计算的缓存值
<!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>
</head>
<body>
<div id="app">
<h1>{{name}}</h1>
<h1>reverseName {{reverseName}}</h1>
<h1>now {{now}}</h1>
</div>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>
var app = new Vue({
el: '#app',
data: {
name: '王哈哈',
event: 'click'
},
computed: {
reverseName(){
return this.name.split('').reverse().join('');
},
now(){
return Date.now();
}
}
})
</script>
</body>
</html>
