SOURCE

    let teacher = {
        name:'苍老师',
        age:18,
        height:155,
        weight:90,
        print:function(){
            console.log(this.name);
            
        },
        boyFriends:[
            {id:1,name:'一'},
            {id:2,name:'二'},
            {id:3,name:'三'},
            {id:4,name:'四'}
        ],
        husband:{
            name : '张三',
            age : 60,
        },
    };
    console.log(teacher.boyFriends)

//  基本
//for(var i = 0; i < teacher.boyFriends.length; i++){
//    if(teacher.boyFriends[i].id !== 3 ){
//        teacher.//boyFriends.splice(i,(teacher.boyFriends.length -1));
//    }
//}

//进阶
// for(let i=teacher.boyFriends.length-1; i>=0; i--){
//     if(teacher.boyFriends[i].id !== 3){
//         teacher.boyFriends.splice(i,1);
//     }
// }

//便利方法
teacher.boyFriends = teacher.boyFriends.filter(({ id }) => id === 3);

//定点删除
//teacher.boyFriends.splice(teacher.boyFriends.findIndex(item => item.id != 3), 1)

console.log(teacher.boyFriends)