如何以非常简单的方式在 JavaScript 中打印星形图案？
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How to print star pattern in JavaScript in a very simple manner?
提问by aspGk
I have tried the code below but it's output is not proper!
我已经尝试了下面的代码，但它的输出不正确！
for(i=5;i>=1;i--) {
for(j=i;j>=1;j--){
console.log(j);
}
console.log("\n");
}回答by user9522108
<html>
<head>
<script type="text/javascript">
var i,j;
for(i=1; i <= 5; i++)
{
for(j=1; j<=i; j++)
{
document.write('*');
}
document.write('<br />');
}
</script>
</head>
<body>
</body>
</html>回答by RK_oo7
for(var i=1; i<=4; i++){
console.log("*".repeat(i));
}
/*
Output is:
"*"
"**"
"***"
"****"
*/
回答by Nver Abgaryan
/** --------------
*
**
***
****
*****
******
*******
********
*********
----------------*/
let y = 10;
let x = 10;
let str = "";
for(let i = 1; i < y; i++ ){
for(let j = 1; j < x; j++){
if(i + j >= y){
str = str.concat("*");
}else{
str = str.concat(" ")
}
}
str = str.concat("\n")
}
console.log(str)
/**_______________________
*********
********
*******
******
*****
****
***
**
*
_______________________*/
let str2 = "";
for(let i = 1; i < y; i++ ){
for(let j = 1; j < x; j++){
if(i <= j ){
str2 = str2.concat("*");
}else{
str2 = str2.concat(" ")
}
}
str2 = str2.concat("\n")
}
console.log(str2)
/**----------------------
*
**
***
****
*****
******
*******
********
-------------------------*/
let str3 = "";
for(let i = 1; i < y; i++ ){
for(let j = 1; j < x; j++){
if(i >= j ){
str3 = str3.concat("*");
}
}
str3 = str3.concat("\n")
}
console.log(str3)
/**-------------------------
*********
********
*******
******
*****
****
***
**
*
---------------------------*/
let str4 = "";
for(let i = 1; i < y; i++ ){
for(let j = 1; j < x; j++){
if( j >= i ){
str4 = str4.concat("*");
}
}
str4 = str4.concat("\n")
}
console.log(str4)
/**--------------------
Diamond of Asterisks
*
***
*****
*******
*********
*******
*****
***
*
---------------------*/
let str5 = "";
for(let i = 1; i < y; i++ ){
for(let j = 1; j < x; j++){
if(i <= y / 2 && j >= (y / 2) - (i - 1) && j <= (y / 2) + (i - 1) ){
str5 = str5.concat("*");
}else if(i >= y / 2
&& j > ((y / 2) - i) * (-1)
&& j < (y - ((y / 2) - i) * (-1))){
str5 = str5.concat("*");
}
else {
str5 = str5.concat(" ");
}
}
str5 = str5.concat("\n");
}
console.log(str5)回答by Rahul Rai
It's very simple, Try this code as below:
很简单，试试下面的代码：
for(var i = 1; i <= 5; i++) {
for(var j = 1; j<= i; j++) {
document.write("*");
}
document.write("<br/>");
}
回答by Mwongera808
for (var line = "#"; line.length < 8; line += "#")
console.log(line);
回答by Rohit Gaikwad
This is the simplest solution which I came across using only one for loop.
这是我只使用一个 for 循环遇到的最简单的解决方案。
var a = '';
var n = 5;
var m = (n-1);
for(i=1; i <= n; i++)
{
a = a.trim();
a = ' '.repeat(m) + a + (i > 1 ? ' ' : '') + '*';
console.log(a);
m--;
}
Output:
输出：
/**------------------------
*
* *
* * *
* * * *
* * * * *
---------------------------*/
回答by Rohit Gaikwad
for (var i = 7; i >= 1; i--) {
var str = "";
for (var j = i; j <= 7; j++) {
str += "*";
}
console.log(str);
}
// This is example
// You can do this with any string and without using the function. 回答by Amanverma Lucky
for (let i = 1; i <= 5; i++) {
for (let j = 1; j <= i; j++) {
document.write('*');
}
document.write('<br />');
}回答by Arul
Just try it out
试试看
**Your Pyramid will be downwards like: **
**你的金字塔会向下像：**
4 3 2 1
3 2 1
2 1
1
function stars(n){
var str = '';
for(var i=n; i>=1; i--){
for(var k=n; k>=i; k--){
str += "\t";
}
for(var j=i; j>=1; j--){
str += j+"\t\t";
}
console.log(str);
str = "";
}
}
stars(3);
Your Pyramid will be upwards like :
你的金字塔会像这样向上：
*
* *
* * *
function stars(n){
var str = '';
for(var i=1; i<=n; i++){
for(var k=1; k<=n-i; k++){
str += "\t";
}
for(var j=1; j<=i; j++){
str += "*\t\t";
}
console.log(str);
str = "";
}
}
stars(3);
回答by zavg
As I understand from your code, you are actually trying to print stairpattern rather than star.
正如我从您的代码中了解到的，您实际上是在尝试打印楼梯图案而不是star。
Your main error consists in that console.logfunction prints every time on the next line.
您的主要错误在于该console.log函数每次都在下一行打印。
for (var i = 5; i >= 1; i--) {
var str = "";
for (var j = i; j >= 1; j--) str += j;
console.log(str);
}
JSFiddle for you: http://jsfiddle.net/99wL8cbt/2/
您的 JSFiddle：http: //jsfiddle.net/99wL8cbt/2/
