[LeetCode][JavaScript]Best Time to Buy and Sell Stock

 1 /**
 2  * @param {number[]} prices
 3  * @return {number}
 4  */
 5 var maxProfit = function(prices) {
 6     var min = Infinity;
 7     var res = -Infinity;
 8     for(var i = 0; i < prices.length; i++){
 9         if(prices[i] < min){
10             min = prices[i];
11         }
12         if(prices[i] > min && prices[i] - min > res){
13             res = prices[i] - min;
14         }
15     }
16     if(isFinite(res)){
17         return res;
18     }else{
19         return 0;
20     }
21 };