<script type="text/javascript">
window.onload = function(){
var app = new Vue({
el:"#app",
data:{
upp:0,
low:0
},
watch:{
upp:function(val){
this.upp = val;
this.low = val.toLowerCase();
},
low:function(val){
this.low = val;
this.upp = val.toUpperCase();
}
}
});
}
</script>
vue代码至此就全都写完了，下面要html出场啦！
<div id="app">
大写：<input type="text" v-model = "upp" />
小写：<input type="text" v-model = "low"/>
</div>
运行效果图：
