vue.js实现一个简单的分页

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<meta charset="utf-8">
<title></title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<script type="text/javascript" src="vue.min.js"></script>
<style>
.page-bar{
    margin:40px;
}
ul,li{
    margin: 0px;
    padding: 0px;
}
li{
    list-style: none
}
.page-bar li:first-child>a {
   margin-left: 0px
}
.page-bar a{
    border: 1px solid #ddd;
    text-decoration: none;
    position: relative;
    float: left;
    padding: 6px 12px;
    margin-left: -1px;
    line-height: 1.42857143;
    color: #337ab7;
    cursor: pointer
}
.page-bar a:hover{
    background-color: #eee;
}
.page-bar a.banclick{
    cursor:not-allowed;
}
.page-bar .active a{
    color: #fff;
    cursor: default;
    background-color: #337ab7;
    border-color: #337ab7;
}
.page-bar i{
    font-style:normal;
    color: #d44950;
    margin: 0px 4px;
    font-size: 12px;
}
</style>
</head>
<body>
 <div class="page-bar">
    <ul>
        <li v-if="cur>1"><a v-on:click="cur--,pageClick()">上一页</a></li>
        <li v-if="cur==1"><a class="banclick">上一页</a></li>
        <li v-for="index in indexs"  v-bind:class="{ 'active': cur == index}">
            <a v-on:click="btnClick(index)">{{ index }}</a>
        </li>
        <li v-if="cur!=all"><a v-on:click="cur++,pageClick()">下一页</a></li>
        <li v-if="cur == all"><a class="banclick">下一页</a></li>
        <li><a>共<i>{{all}}</i>页</a></li>
    </ul>
</div>
<script type="text/javascript">
var pageBar = new Vue({
    el: '.page-bar',
    data: {
        all: 20, //总页数
        cur: 1//当前页码
    },
    watch: {
        cur: function(oldValue , newValue){
            console.log(arguments);
        }
    },    
     methods: {
        btnClick: function(data){//页码点击事件
            if(data != this.cur){
                this.cur = data 
            }
        },
        pageClick: function(){
            console.log('现在在'+this.cur+'页');
        }
    },
    
    computed: {
        indexs: function(){
          var left = 1;
          var right = this.all;
          var ar = [];
          if(this.all>= 5){
            if(this.cur > 3 && this.cur < this.all-2){
                    left = this.cur - 2
                    right = this.cur + 2
            }else{
                if(this.cur<=3){
                    left = 1
                    right = 5
                }else{
                    right = this.all
                    left = this.all -4
                }
            }
         }
        while (left <= right){
            ar.push(left)
            left ++
        }
        return ar
       }
         
    }
})
</script>
</body>
</html>