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Vue.filter('format',function(value){
return value.substr(0, 1);
});
var vm=new Vue({
el:'#box',
data:{
list:[
{msg:"11",id:1},
{msg:"22",id:2},
{msg:"33",id:3}
]
}
});
<div id="box" v-for="item in list" >
{{item.msg | format}}
</div>