只有一个帖子字符串有效

exports.main_handler = async (event, context, callback) => {
    const post = event.post; // 帖子字符串

    const stack = [];
    const leftBrackets = ['(', '[', '{'];
    const rightBrackets = [')', ']', '}'];

    for (let i = 0; i < post.length; i++) {
        const char = post[i];
        if (leftBrackets.includes(char)) {
            stack.push(char);
        } else if (rightBrackets.includes(char)) {
            if (stack.length === 0) {
                return false;
            }
            const top = stack.pop();
            if (
                (char === ')' && top !== '(') ||
                (char === ']' && top !== '[') ||
                (char === '}' && top !== '{')
            ) {
                return false;
            }
        }
    }

    return stack.length === 0;
};