v-show将元素隐藏是在dom节点上加style=’display:none’
v-if是直接将元素完全去掉
拿v-show示例，(v-if 也是一样，把下面的代码中v-show替换成v-if即可运行)
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<script src="http://unpkg.com/vue/dist/vue.js"></script>
<script type="text/javascript">
window.onload = function(){
var vm = new Vue({
el:'#box',
data:{
isShow:false,
},
methods:{
toggle:function(){
this.isShow = !this.isShow;
}
}
});
}
</script>
</head>
<body>
<div id="box">
<input type="button" value="toggle" v-on:click="toggle()"> <br />
<div v-show="isShow" style="width: 100px;height: 100px;background: red"></div>
</div>
</body>
</html>