js括号匹配检验

String.prototype.bracket = function() {
    var stack = [];
    var sArr = this.split("");
    sArr.forEach(function(e) {
        if (/(\(|\[|\{)/.test(e)) {
            stack.push(e);
        } else {
            switch (e) {
                case ")":
                    var top = stack.pop();
                    if (top !== "(") {
                        return false;
                    }
                    break;
                case "]":
                    var top = stack.pop();
                    if (top !== "[") {
                        return false;
                    }
                    break;
                case "}":
                    var top = stack.pop();
                    if (top !== "{") {
                        return false;
                    }
                    break;
                default:

            }
        }
    });
    return stack.length === 0;
}

console.log("{eqwe(qw}()".bracket()); //false
console.log("{gary(chang)[cn]}(c)".bracket()); //true