[‘小明’,’小红’,’小强’,’张三’]在排队当叫到名字的人排到队伍前面，比如叫到了‘小强’，现在的排队顺序为[’小强’,‘小明’,’小红’,’张三’]

Question

问题遇到的现象和发生背景 [‘小明’,’小红’,’小强’,’张三’]在排队当叫到名字的人排到队伍前面，比如叫到了‘小强’，现在的排队顺序为[’小强’,‘小明’,’小红’,’张三’]用js怎么实现

Answer 1

let stu = ['小明','小红','小强','张三'];
function aa(arr,str){
    let i = arr.indexOf(str);
    if( i !== -1 ){
        arr.unshift(...arr.splice(i,1))
        return arr
    }else{
        return "不存在"
    }
}


console.log(aa(stu,"小强")) //["小强","小明","小红","张三"]
console.log(aa(stu,"小红")) // ["小红","小强","小明","张三"]
console.log(aa(stu,"小")) // 不存在