页面如何获取checkbox选中的多个值？

<input type="checkbox" name="test" value="1"/><span>1</span>
<input type="checkbox" name="test" value="2"/><span>2</span>
<input type="checkbox" name="test" value="3"/><span>3</span>
<input type="checkbox" name="test" value="4"/><span>4</span>
<input type="checkbox" name="test" value="5"/><span>5</span>
<input type='button' value='提交' onclick="show()"/>

function show(){
    obj = document.getElementsByName("test");
    check_val = [];
    for(k in obj){
        if(obj[k].checked)
            check_val.push(obj[k].value);
    }
    alert(check_val);
}

<div id="d5">
    <p>{{box5.toString()}}</p>
    <input type="checkbox" v-model="box5" value="red">
    <input type="checkbox" v-model="box5" value="黄">
    <input type="checkbox" v-model="box5" value="蓝">
</div>
<script>
    new Vue({
        el:'#d5',
        data:{
        box5:[]
    }
    })
</script>    

export default {
        name:'checkbox',
        data(){
            return {
                checkedValue:[],//一定必须是数组不能是字符串
                answer:[],
            }
        },
  watch:{
        checkedValue:function(new_v,old_v){
            this.answer=this.checkedValue;
        }
    },
}