javascript数据结构（栈）解决佩兹糖果盒问题

function Stack() {
    this.top = 0;
    this.dataStore = [];
    this.push = push;
    this.pop = pop;
    this.peek = peek;
    this.length = length;
    this.clear = clear;
    this.toString = toString;
};
//push压栈
function push(element) {
    this.dataStore[this.top++] = element;
};
//pop出栈
function pop() {
    return this.dataStore[--this.top];
};
//peek查询栈顶元素
function peek() {
    return this.dataStore[this.top-1];
};
//length返回栈内元素个数
function length() {
    return this.top;
};
//clear清空栈内元素
function clear() {
    this.top = 0;

};

var sweetBox = new Stack();
sweetBox.push('red');
sweetBox.push('yellow');
sweetBox.push('red');
sweetBox.push('yellow');
sweetBox.push('red');
sweetBox.push('white');
sweetBox.push('yellow');
sweetBox.push('white');
sweetBox.push('yellow');
sweetBox.push('white');
sweetBox.push('red');
//取出不喜欢的颜色 get
function getColor(element,stack) {
    var getColorStack = new Stack();
    var setColorStack = new Stack();
    while(stack.length()>0){
        if(stack.peek() == element){
            getColorStack.push(element);
            stack.pop();
        }else{
            setColorStack.push(stack.peek());
            stack.pop();
        }
    }
    while (setColorStack.length()>0){
        stack.push(setColorStack.peek());
        setColorStack.pop();
    }
    console.log(stack.peek());
}
getColor('red',sweetBox);