js代碼如下：

    function Stack(){
        let items = [];
        // 各種屬性和方法的聲明
        this.push = function(element) {
            items.push(element);
        }
        this.pop = function(){
            return items.pop();
        }
        // 返回棧頂元素
        this.peek = function(){
            return items[items.length-1];
        }
        this.isEmpty = function(){
            return items.length == 0;
        }
        this.size = function(){
            return items.length;
        }
        this.clear = function(){
            items = [];
        }
        this.print = function(){
            console.log(items.toString());
        }
    }
    
    let st = new Stack();
    console.log(st.isEmpty());
    st.push(1);
    st.push(2);
    st.push(3);
    console.log(st.peek());
    console.log(st.isEmpty());
    console.log(st.print());
    st.pop();
    console.log(st.print());

輸出結(jié)果為：
true
3
false
1,2,3
undefined
1,2
undefined