function Stack(){	this.dataStore = [];	this.top = 0;	this.pop = pop;	this.push = push;	this.peek = peek;	this.clear = clear;	this.length = length;	this.show = show;}function push(element){	this.dataStore[this.top++] = element;}function pop(){	this.dataStore[--this.top];}function peek(){	return this.dataStore(this.top - 1);}function clear(){	this.dataStore = [];}function length(){	return this.dataStore.length;}function show(){	return this.dataStore;}	var stack = new Stack();stack.push('张三');stack.push('李四');stack.push('王五');stack.pop();stack.push('赵六');alert(stack.show());