1. /**
    2.  * @param {number[]} nums
    3.  * @return {boolean}
    4.  */
    5. var canJump = function(nums) {
    6.     if(nums.length < 2) return true
    7.     let i = 0,
    8.         cur = 0,
    9.         length = nums.length
    11.     for(let i = 0; i < length - 1; i++) {
    12.         if(nums[i] > cur) {
    13.             cur = nums[i]
    14.         }
    16.         if(cur <= 0) return false
    18.         if(cur >= length - 1 - i) return true
    20.         cur --
    21.     }
    23.     return false
    24. };