如何用JS判断数组中是否存在某个值或者某个对象的值

const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];
 
console.log(beasts.indexOf('bison'));
// expected output: 1
 
// start from index 2
console.log(beasts.indexOf('bison', 2));
// expected output: 4
 
console.log(beasts.indexOf('giraffe'));
// expected output: -1

const array1 = [1, 2, 3];
 
console.log(array1.includes(2));
// expected output: true
 
const pets = ['cat', 'dog', 'bat'];
 
console.log(pets.includes('cat'));
// expected output: true
 
console.log(pets.includes('at'));
// expected output: false

const array1 = [5, 12, 8, 130, 44];
 
const found = array1.find(element => element > 10);
 
console.log(found);
// expected output: 12

const array1 = [5, 12, 8, 130, 44];
 
const isLargeNumber = (element) => element > 13;
 
console.log(array1.findIndex(isLargeNumber));
// expected output: 3

const arr = [{id:1, name:'name1'}, {id:2, name:'name2'}, {id:3, name:'name3'}];
 
const res = arr.find((ev) => {
    return ev.id === 3;
});
console.log(res);
// expected output: { id: 3, name: "name3" }
 
const ret = arr.find((ev) => {
    return ev.id === 4;
});
console.log(ret);
// expected output: undefined

const arr = [{id:1, name:'name1'}, {id:2, name:'name2'}, {id:3, name:'name3'}];
 
const res = arr.findIndex((ev) => {
    return ev.id === 3;
});
console.log(res);
// expected output: 2
 
const ret = arr.findIndex((ev) => {
    return ev.id === 4;
});
console.log(ret);
// expected output: -1

var  str = ["a", "b", "c"];
    var index = str.indexOf("a");
    if(index>-1){//大于0 代表存在，
    str.splice(index,1);//存在就删除
}
console.log(str);// ["b", "c"]

var searchinfo =[
                    { key: '999', name: 'zhangsan'},
                    { key: '111', name: 'lisi'},
                    { key: '222', name: 'wanger'},
                    { key: '333', name: 'apple'},
                    { key: '444', name: 'orange'},
    
                ]
for (var i = 0; i < searchinfo.length; i++) {
            if ((searchinfo[i].key).indexOf("999") > -1) {//判断key为999的对象是否存在，
                index = i;
                searchinfo.splice(index, 1);//存在即删除
            }
        }
console.log(searchinfo);

var searchinfo =[
                    { key: '999', name: 'zhangsan'},
                    { key: '111', name: 'lisi'},
                    { key: '222', name: 'wanger'},
                    { key: '333', name: 'apple'},
                    { key: '444', name: 'orange'},
    
                ]
var str1 = searchinfo.some(item => item.key =="999");
console.log(str);//true   存在
var str2 = searchinfo.some(item => item.key =="121");
console.log(str);//false    不存在