[못품/leetcode/javascript] 121.Best Time to Buy and Sell stock

var maxProfit = function(prices) {
    let min = prices[0];
    let profit = 0;
    for(let i=0;i<prices.length;i++){
        min = Math.min(min,prices[i]);
        profit = Math.max(profit,prices[i]-min)
    }
    return profit
};