JavaScript——基于对象的方法打印*金字塔

最新推荐文章于 2024-07-20 13:01:43 发布

Elvira_D

最新推荐文章于 2024-07-20 13:01:43 发布

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分类专栏： JavaScript

本文链接：https://blog.youkuaiyun.com/u011435776/article/details/79720060

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本文介绍了一种使用JavaScript实现的图形打印算法，包括实心和空心的金字塔及菱形图案。通过对行数和字符数的精确控制，实现了不同形状的打印，并展示了如何在网页上输出这些图形。

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1. 要求：

思路：算出每行要打印的“*”数与空格数

第i行：“*”号数 2*i-1 空格数 num-i

function Pig() {
}
Pig.prototype.name = "George";
Pig.prototype.age = 6;
Pig.prototype.weight = 30;
Pig.prototype.color = "pink";
Pig.prototype.print = function(num) {
	for (var i = 1; i < num+1; i++) {
		var times = 2*i-1;
		var time = 0;
		while(time!= num-i){
			document.write("&nbsp;");//空格需通过转义后打印,如果格式不正确，需检查此处是“ ”还是转义字符“&nbsp;”
			time++;
		}
		while(times!= 0){
			document.write("*");
			times--;
		}
		document.write("<br />");
	}
}
var pig1 = new Pig();
pig1.print(5);

2. 菱形

function Pig() {
}
Pig.prototype.name = "George";
Pig.prototype.age = 6;
Pig.prototype.weight = 30;
Pig.prototype.color = "pink";
Pig.prototype.print = function(num) {
	for (var i = 1; i < num+1; i++) {
		var times = 2*i-1;
		var time = 0;
		while(time!= num-i){
			document.write("&nbsp;");
			time++;
		}
		while(times!= 0){
			document.write("*");
			times--;
		}
		document.write("<br />");
	}
	for (var i = num-1; i > 0; i--) {
		var times = 2*i-1;
		var time = 0;
		while(time!= num-i){
			document.write("&nbsp;");
			time++;
		}
		while(times!= 0){
			document.write("*");
			times--;
		}
		document.write("<br />");
	}
}
var pig1 = new Pig();
pig1.print(5);

3. 空心金字塔

function Pig() {
}
Pig.prototype.name = "George";
Pig.prototype.age = 6;
Pig.prototype.weight = 30;
Pig.prototype.color = "pink";
Pig.prototype.print = function(num) {
	for (var i = 1; i < num; i++) {
		for (var time = 1; time < num+i; time++) {
			if((time == num-i+1)||(time == num+i-1))
				document.write("*");
			else {
				document.write("&nbsp;");
			}
		}
		document.write("<br />");
	}
	var times = 2*num-1;
	while(times!=0){
		document.write("*");
		times--;
	}
}
var pig1 = new Pig();
pig1.print(5);

4.空心菱形

function Pig() {
}
Pig.prototype.name = "George";
Pig.prototype.age = 6;
Pig.prototype.weight = 30;
Pig.prototype.color = "pink";
Pig.prototype.print = function(num) {
	for (var i = 1; i < num+1; i++) {
		for (var time = 1; time < num+i; time++) {
			if((time == num-i+1)||(time == num+i-1))
				document.write("*");
			else {
				document.write("&nbsp;");
			}
		}
		document.write("<br />");
	}
	for (var i = num-1; i >0; i--) {
		for (var time = 1; time < num+i; time++) {
			if((time == num-i+1)||(time == num+i-1))
				document.write("*");
			else {
				document.write("&nbsp;");
			}
		}
		document.write("<br />");
	}
}
var pig1 = new Pig();
pig1.print(5);