用（delete 对象.属性 ）的方式进行；
var people={"name":"zhangsan",age:18}; delete a.age;
var people={"name":"zhangsan",age:18}; var peolpe={};
两种方式 delete 和 splice
delete 删除，删除后，student[0]位置会编程undefined
splice 删除，两个参数，（index,num）标识从index位置删除几个，是彻底删除，后面位置的数组元素，顺序上移；
var student=[ {"name":"zhangsan",age:18}, {"name":"wangwu",age:17}, {"name":"xiaohong",age:16} ]; delete student[0]
//[undefined,{wangwu},{xiaohong}]
student.splice(0,1);
//[{wangwu},{xiaohong}]
原文：https://www.cnblogs.com/perferect/p/12882176.html