侦听器
侦听器常用于数据变化时执行异步操作或耗时较长的操作
侦听器的用法:
var vm = new Vue({
el: '#app',
data: {
fristName: 'xukun',
lastName: 'cai',
fullName: 'xukun cai'
},
watch: {
fristName: function(val) {
this.fullName = val + ' ' + this.lastName;
},
lastName: function(val) {
this.fullName = this.fristName + ' ' + val;
}
}
})