https://leetcode-cn.com/problems/diao-zheng-shu-zu-shun-xu-shi-qi-shu-wei-yu-ou-shu-qian-mian-lcof/
/**
* @param {number[]} nums
* @return {number[]}
*/
var exchange = function(nums) {
let i = 0;
let j = nums.length-1;
let temp;
while(i<j){
while(i<j&&(nums[i]%2==1)){
i++;
}
while(i<j&&(nums[j]%2==0)){
j--;
}
temp = nums[i];
nums[i]=nums[j]
nums[j]=temp
}
return nums;
};