vue computed自动计算

<!DOCTYPE html>
<html>
<head>
	<title>vue</title>
	<meta charset="utf-8">
	<script type="text/javascript" src="lodash.min.js"></script>
	<script type="text/javascript" src="vue.js"></script>
	<style type="text/css">
		*{margin:0;padding:0;}
		table,tr,th,td{border:1px solid #ccc;}
		#page{width:1000px;margin:40px auto;}
		#page table{width:100%;}
		#page .box{
			margin-top:30px;
		}
	</style>
</head>
<body>
    <div id="page">
    	<table>
    		<tr>
    		    <th>开始时间</th>
    			<th>结束时间</th>
    			<th>姓名</th>
    			<th>年龄</th>
    			<th>性别</th>
    			<th>操作</th>
    		</tr>
    		<tr v-for="item in list">
    		    <td><input type="text" v-model="item.start" ></td>
    		    <td><input type="text" v-model="item.end" ></td>
    			<td><input type="text" v-model="item.name" ></td>
    			<td><input type="text" v-model="item.age"></td>
    			<td><input type="text" v-model="item.sex"></td>
    			<td>
    				<button @click="add($index)">添加</button>  
    				<button @click="remove($index)">删除</button>
    			</td>
    		</tr>
    	</table>

    	<div class="box">
    		{{calcRes}}
    	</div>
    </div>
	<script type="text/javascript">
		new Vue({
			el:'#page',
			data:{
				list:[
					{start:24,end:3223,name:'zjs',age:23,sex:'boy'}
				]
			},
			methods:{
				add:function(parm){
                   var obj = {start:0,end:0,name:'',age:'',sex:''};
                   this.list.splice(parm+1,0,obj);
				},
				remove:function(parm){
				   if(this.list.length>1){
				   	 this.list.splice(parm,1);
				   	}else{
				   		alert("至少有一条")
				   	}
				}
			},
			computed:{
               calcRes:function(){
               	  var total = [];
               	  var days = 0;
                  for(var i = 0; i < this.list.length; i++){
                  	  var arr = [];
                  	  if( parseInt(this.list[i].end) - parseInt(this.list[i].start) >= 0){
                  	  	 this.list[i].name ? arr.push(this.list[i].name) : '';
                         this.list[i].age ? arr.push(this.list[i].age) : '';
                         this.list[i].sex ? arr.push(this.list[i].sex) : '';
                         if(this.list[i].name || this.list[i].age || this.list[i].sex){
                             total.push(_.uniq(arr).length + 1);
                         }
                  	  }else{
                  	  	alert("第"+(i+1)+"有问题");
                  	  	continue;
                  	  }
                  }
                  for(var j = 0; j < total.length; j++){
                        days += total[j];
                  }
                  return days;
               }
			},
			ready:function(){

			}
		})
	</script>
</body>
</html>

　　

<!DOCTYPE html> <html> <head> <title>vue</title> <meta charset="utf-8"> <script type="text/javascript" src="lodash.min.js"></script> <script type="text/javascript" src="vue.js"></script> <style type="text/css"> *{margin:0;padding:0;} table,tr,th,td{border:1px solid #ccc;} #page{width:1000px;margin:40px auto;} #page table{width:100%;} #page .box{ margin-top:30px; } </style> </head> <body> <div id="page"> <table> <tr> <th>开始时间</th> <th>结束时间</th> <th>姓名</th> <th>年龄</th> <th>性别</th> <th>操作</th> </tr> <tr v-for="item in list"> <td><input type="text" v-model="item.start" ></td> <td><input type="text" v-model="item.end" ></td> <td><input type="text" v-model="item.name" ></td> <td><input type="text" v-model="item.age"></td> <td><input type="text" v-model="item.sex"></td> <td> <button @click="add($index)">添加</button>   <button @click="remove($index)">删除</button> </td> </tr> </table> <div class="box"> {{calcRes}} </div> </div> <script type="text/javascript"> new Vue({ el:'#page', data:{ list:[ {start:2423423,end:3223,name:'zjs',age:23,sex:'boy'} ] }, methods:{ add:function(parm){ var obj = {start:0,end:0,name:'',age:'',sex:''}; this.list.splice(parm+1,0,obj); }, remove:function(parm){ if(this.list.length>1){ this.list.splice(parm,1); }else{ alert("至少有一条") } } }, computed:{ calcRes:function(){ var total = []; var days = 0; for(var i = 0; i < this.list.length; i++){ var arr = []; if( parseInt(this.list[i].end) - parseInt(this.list[i].start) >= 0){ this.list[i].name ? arr.push(this.list[i].name) : ''; this.list[i].age ? arr.push(this.list[i].age) : ''; this.list[i].sex ? arr.push(this.list[i].sex) : ''; if(this.list[i].name || this.list[i].age || this.list[i].sex){ total.push(_.uniq(arr).length + 1); } } } for(var j = 0; j < total.length; j++){ days += total[j]; } return days; } }, ready:function(){ } }) </script> </body> </html>