五种Javascript将每2个字符拆分为数组的方法

var a = 12345678;
a= a.toString();
var arr=[];
for (var i =0; i<a.length-1; i++) {
 arr.push(Number(a[i]+''+a[i+1]));
}
console.log(arr);

var str = "12345678",
    length = str.length - 1,
    output = Array.from({ length }, (_,i) => +str.slice(i, i+2))
console.log(output)

function getChunks(number, size) {
  let str = number.toString(),
      length = str.length - size + 1;
      
  return Array.from({ length }, (_,i) => +str.slice(i, i + size))
}
console.log(getChunks(12345, 3))
console.log(getChunks(12345678, 2))

var a = 12345678;
const result = a.toString().split("").reduce((acc, ele, idx, arr) => {
  return arr[idx + 1] ? acc.concat(+(ele + arr[idx + 1])) : acc;
}, []);
console.log(result);
console.assert(result, [12,23,34,45,56,67,78]);

var str ='12345678';
const eleven = string => {
  let result = [];
  let singles = string.split('');
  let first = Number(singles.splice(0, 2).join(''));
  for (let i = 0; i < string.length-1; i++) {
    let next = 11 * i;
    result.push(first+next);
  }
  return result;
}  
console.log(eleven(str));

输出结果：