leetcode 682.棒球比赛 javascript实现

/**
 * @param {string[]} ops
 * @return {number}
 */
var calPoints = function(ops) {
    let sum = 0;
    const stack = []
    for(let i = 0; i < ops.length; i++) {
        if(ops[i] == 'C') {
            stack.pop()
        } else if (ops[i] == 'D') {
            stack.push(stack[stack.length - 1] * 2)
        } else if(ops[i] == '+') {
            stack.push(stack[stack.length - 1] + stack[stack.length - 2])
        } else {
            stack.push(parseInt(ops[i]))
        }
    }
    stack.forEach(item => {
        sum += item
    })
    return sum
};