~~~ //HTML <div id="app"> <div>{{sum}}</div> </div> ~~~ ~~~ //JS var vm = new Vue({ el: "#app", data: { num1: "Li", num2: "lei" }, computed: { sum: { get() { return this.num1 + this.num2 }, set(value) { var arr = value.split(" "); this.num1 = arr[0]; this.num2 = arr[1]; } } } }) ~~~ ~~~ vm.sum="hello world" ~~~