父子组件通信练习：
<div id='app'>
<chat></chat>
</div>
<script src='js/vue.js'></script>
<script>
Vue.component('chat',{
template:`
<div>
<ul>
<li v-for="value in arr">{{value}}</li>
</ul>
<user @send='rcvMsg' userName='jack'></user>
<user @send='rcvMsg' userName='rose'></user>
</div>
`,
data:function(){
return{
arr:[]
}
},
methods:{
rcvMsg:function(txt){
this.arr.push(txt)
}
}
})
Vue.component('user',{
props:['userName'],
template:`
<div>
<label>{{userName}}</label>
<input type='text' v-model='inputVal'>
<button @click='sendMsg'>发送</button>
</div>
`,
data:function(){
return{
inputVal:''
}
},
methods:{
sendMsg:function(){
this.$emit('send',this.userName+':'+this.inputVal)
}
}
})
new Vue({
el:'#app'
})
</script>
生命周期：
<div id='app'>{{msg}}</div>
<script src='vue/dist/vue.js'></script>
<script>
new Vue({
el:'#app',
data:{
msg:'hello vue'
},
beforeCreate:function(){
alert('beforeCreated');
},
created:function(){
alert('created')
},
beforeMount:function(){
alert('beforMount')
},
mounted:function(){
alert('mounted')
}
})
</script>
Vue的所有钩子函数：
beforeCreate
created
beforeMount
mounted
beforeUpdate
updated
beforeDestroy
destroyed
