export default {
 name: 'HelloWorld',
 components: {
 ChildCom//调用组件
 },

export default {
 name: 'Child',
 PRops: [
 'card_ITem'
 ],
 data () {
 return {
 }
 }
}

<div v-if="flag_danshu==1">
<Child-com id="1" class="list" v-for="(stu,index1) in new_list_danshu" :key="index1" :card_item="stu" >
</Child-com>
</div>
 <div v-else-if="flag_shuangshu==1">
<Child-com id="2" class="list" v-for="(stu,index2) in new_list_shuangshu" :key="index2" :card_item="stu" >
</Child-com>
</div>
 <div v-else-if="flag_all==1">
<Child-com id="3" class="list" v-for="(stu,index3) in stu_list" :key="index3" :card_item="stu">
</Child-com>
</div>

<div>姓名：{{ card_item.name }} </div>
  <div>学号：{{card_item.stuId}}</div>
  <div v-if="card_item.gender==1">性别：男</div>
  <div v-else>性别：女</div>

 danshu (stu_list) {
  this.new_list_danshu=[];
  stu_list.foreach((item) => {
   if(item.stuId%2!=0)
   this.new_list_danshu.push(item);//符合条件则加进用来存储单数信息的json数组
   }
  )
  // alert(this.new_list[1]);
  this.flag_all=0; //显示全部
  this.flag_danshu=1;//显示单数
  this.flag_shuangshu=0;//显示双数
  
 },

 add:function(){
 VAR name = document.getElementById("stu_name").value;
 var id = document.getElementById("stu_id").value;
 var gender = document.getElementById("stu_gender").value;
 if(name==''||id==''||gender==''){
  alert('请完善信息');
  }
  else{
  var item ={};
  item.stuId=id;
  item.name=name;
  item.gender=gender;
  this.stu_list.push(item);
  alert('添加成功');
  
  }
 }