1.父组件向子组件传值
2.子组件向父组件传值
3.非父子间组件传值
1.父组件向子组件传值
- 组件内部通过props接收传递过来的值
Vue.component('menu-item',{
props:['title'],
template:'<div>{{title}}</div>'})
- 父组件通过属性将值传递给子组件
<menu-item title="来着父组件的值"></ment-item>
<menu-item :title="title"></menu-item>
3 . props属性名规则
- 在props中使用驼峰形式,模板中需要使用短横线的形式
- 字符串形式的模板中没有这个限制
//js中是驼峰式
Vue.component('menu-item',{props:['menu-menuTitle'],template:'<div>{{menuTitle}}</div>'})
//短横线式html
<menu-item menu-title="nihao"></menu-item>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div>{{pmsg}}</div>
<menu-item :menu-title='ptitle'></menu-item>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
Vue.component('third-com', {
props: ['testTile'],
template: '<div>{{testTile}}</div>'
});
Vue.component('menu-item', {
props: ['menuTitle'],
template: '<div>{{menuTitle}}<third-com testTile="hello"></third-com></div>'
});
var vm = new Vue({
el: '#app',
data: {
pmsg: '父组件中内容',
ptitle: '动态绑定属性'
}
});
</script>
</body>
</html>
props属性值类型 ?字符串String ?数值Number ?布尔值Boolean ?数组Array ?对象Object
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div>{{pmsg}}</div>
<menu-item :pstr='pstr' :pnum='12' pboo='true' :parr='parr' :pobj='pobj'></menu-item>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
Vue.component('menu-item', {
props: ['pstr','pnum','pboo','parr','pobj'],
template: `
<div>
<div>{{pstr}}</div>
<div>{{12 + pnum}}</div>
<div>{{typeof pboo}}</div>
<ul>
<li :key='index' v-for='(item,index) in parr'>{{item}}</li>
</ul>
<span>{{pobj.name}}</span>
<span>{{pobj.age}}</span>
</div>
</div>
`
});
var vm = new Vue({
el: '#app',
data: {
pmsg: '父组件中内容',
pstr: 'hello',
parr: ['apple','orange','banana'],
pobj: {
name: 'lisi',
age: 12
}
}
});
</script>
</body>
</html>
2.子组件向父组件传值
1.子组件通过自定义事件向父组件传递信息
<button v-on:click='$emit'("enlarge-text",0.1}>扩大字体</button>
2.父组件监听子组件的事件
<menu-item v-on:enlarge-text="fontSize" +=$event></menu-item>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div :style='{fontSize: fontSize + "px"}'>{{pmsg}}</div>
<menu-item :parr='parr' @enlarge-text='handle'></menu-item>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
Vue.component('menu-item', {
props: ['parr'],
template: `
<div>
<ul>
<li :key='index' v-for='(item,index) in parr'>{{item}}</li>
</ul>
<button @click='$emit("enlarge-text")'>扩大父组件中字体大小</button>
</div>
`
});
var vm = new Vue({
el: '#app',
data: {
pmsg: '父组件中内容',
parr: ['apple','orange','banana'],
fontSize: 10
},
methods: {
handle: function(){
this.fontSize += 5;
}
}
});
</script>
</body>
</html>
子组件向父组件传值,携带参数
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div :style='{fontSize: fontSize + "px"}'>{{pmsg}}</div>
<menu-item :parr='parr' @enlarge-text='handle($event)'></menu-item>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
Vue.component('menu-item', {
props: ['parr'],
template: `
<div>
<ul>
<li :key='index' v-for='(item,index) in parr'>{{item}}</li>
</ul>
<button @click='$emit("enlarge-text", 5)'>扩大父组件中字体大小</button>
<button @click='$emit("enlarge-text", 10)'>扩大父组件中字体大小</button>
</div>
`
});
var vm = new Vue({
el: '#app',
data: {
pmsg: '父组件中内容',
parr: ['apple','orange','banana'],
fontSize: 10
},
methods: {
handle: function(val){
this.fontSize += val;
}
}
});
</script>
</body>
</html>
3.非父子间组件传值
1.单独的事件中心管理组件间的通信
var eventHub = new Vue()
2.监听事件与销毁事件
- 兄弟之间传递数据需要借助于事件中心,通过事件中心传递数据
- 提供事件中心 var hub = new Vue()
- 传递数据方,通过一个事件触发hub.$emit(方法名,传递的数据)
- 接收数据方,通过mounted(){} 钩子中 触发hub.$on()方法名
- 销毁事件 通过hub.$off()方法名销毁之后无法进行传递数据
eventHub.$on('add-todo',addTodo)
eventHub.$off('add-todo')
3.触发事件
eventHub.$emit('add-todo',id)
点击TOM下方按钮,会给JERRY增加2,点击一次增加2. 点击JERRY下方按钮,会给TOM增加1,点击一次增加1. 点击事件销毁,则不再进行变化
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div>父组件</div>
<div>
<button @click='handle'>销毁事件</button>
</div>
<test-tom></test-tom>
<test-jerry></test-jerry>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
var hub = new Vue();
Vue.component('test-tom', {
data: function(){
return {
num: 0
}
},
template: `
<div>
<div>TOM:{{num}}</div>
<div>
<button @click='handle'>点击</button>
</div>
</div>
`,
methods: {
handle: function(){
hub.$emit('jerry-event', 2);
}
},
mounted: function() {
hub.$on('tom-event', (val) => {
this.num += val;
});
}
});
Vue.component('test-jerry', {
data: function(){
return {
num: 0
}
},
template: `
<div>
<div>JERRY:{{num}}</div>
<div>
<button @click='handle'>点击</button>
</div>
</div>
`,
methods: {
handle: function(){
hub.$emit('tom-event', 1);
}
},
mounted: function() {
hub.$on('jerry-event', (val) => {
this.num += val;
});
}
});
var vm = new Vue({
el: '#app',
data: {
},
methods: {
handle: function(){
hub.$off('tom-event');
hub.$off('jerry-event');
}
}
});
</script>
</body>
</html>
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