js常用删除

1.对象删除

1.1删除属性

用（delete 对象.属性 ）的方式进行；

var people={"name":"zhangsan",age:18};
delete a.age;

1.2 对象的清空

var people={"name":"zhangsan",age:18};
var peolpe={};

2.数组的删除

2.1 某个元素的删除

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}]