js找出数字在数组中下一个相邻的元素

let arr = ["2", "4", "6", "8", "10", "12", "14", "16", "18", "20", "22", "24", "27", "30", "33", "36", "42", "48", "54", "60"]
var rr = [];
function name(n) {
let num = Number(n);
for (let i = 0; i < arr.length; i++) {
const element = arr[i];
if(element!=num){
rr.push(num--);
}
}
return rr.find((el)=>{
let newel = String(el);
return arr.includes(newel);
})
}
let newn = String(name("56"));
console.log(newn);
 

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作者：Vam的金豆之路

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