父组件向子组件传值
<!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">
/*
父组件向子组件传值-props属性值类型
*/
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>
子组件向父组件传值-基本用法
props传递数据原则：单向数据流
1. 子组件通过自定义事件向父组件传递信息
2. 父组件监听子组件的事件
<!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='$emit("enlarge-text")'>扩大父组件中字体大小</button>
</div>
`
});
var vm = new Vue({
el: '#app',
data: {
pmsg: '父组件中内容',
parr: ['apple','orange','banana'],
fontSize: 10
},
methods: {
handle: function(){
// 扩大字体大小
this.fontSize += 5;
}
}
});
</script>
</body>
</html>
子组件向父组件传值-携带参数
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<div :style='{fontSize: fontSize + "px"}'>{{pmsg}}</div>
<menu-item :parr='parr' @enlarge-text='handle($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='$emit("enlarge-text", 5)'>扩大父组件中字体大小5px</button>
<button @click='$emit("enlarge-text", 10)'>扩大父组件中字体大小10px</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){
// 扩大字体大小
this.fontSize += val;
}
}
});
</script>
</body>
</html>
非父子组件间传值
<!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">
/*
兄弟组件之间数据传递
*/
// 提供事件中心
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.$emit('jerry-event', 2);
}
},
mounted: function() {
// 监听事件
hub.$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(){
// 触发兄弟组件的事件
hub.$emit('tom-event', 1);
}
},
mounted: function() {
// 监听事件
hub.$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>
