add: function() {
var obj = {};
var id = document.querySelector(".id").value; //姓名
var name = document.querySelector(".name").value; //姓名
var age = document.querySelector(".age").value; //年龄
var height = document.querySelector(".height").value; //身高
var school = document.querySelector(".school").value; //学校
obj.name = name;
obj.age = age;
obj.height = height;
obj.school = school;
alert("ssss ");
this.msg.push(obj);