我今天刚开始使用 javascript 来完成一项学校任务。我的任务是用星星制作菱形图案，但我不明白如何制作底部金字塔我试过改变一切，这段代码在我脑海中起作用但没有正确执行。这是我制作的代码function clicked() { var x = document.getElementById("num").value; if (x < 50) { document.write("Your Number is: " + x + "<br />Your number is lower than 50<br />"); } else if (x > 50) { document.write("Your Number is: " + x + "<br />Your number is more than50<br />"); } else { document.write("Your Number is: " + x + "<br />Your number is equal to 50<br />"); } for (var i = 1; i <= x; i++) { for (var k = 1; k <= x - i; k++) { document.write(" "); } for (var j = 1; j <= i; j++) { document.write("*"); } document.write("<br/>"); } var m = 1; for (var l = x - m; l <= x - m; m++) { for (var n = 1; n <= l; n++) { document.write("*"); } document.write("<br/>"); }}<body><input type="number" id="num" placeholder="Enter Number"><br><button onclick="clicked()">SUBMIT</button></body>
1 回答
神不在的星期二
TA贡献1963条经验 获得超6个赞
我对您的代码进行了细微修改。你几乎拥有它。我会按原样重用相同的嵌套 for 循环。只需更改循环的顶层。
金字塔的顶端运行：
for(var i=1; i<=x;i++)
底部金字塔用于：
for(var i=x-1; i>=1; i--)
您应该考虑将重复的嵌套代码移动到一个函数中，并将 的值i作为参数传递给该函数。
function clicked() {
var x = document.getElementById("num").value;
if (x < 50) {
document.write("Your Number is: " + x + "<br />Your number is lower than 50<br />");
} else if (x > 50) {
document.write("Your Number is: " + x + "<br />Your number is more than50<br />");
} else {
document.write("Your Number is: " + x + "<br />Your number is equal to 50<br />");
}
for (var i = 1; i <= x; i++) {
for (var k = 1; k <= x - i; k++) {
document.write(" ");
}
for (var j = 1; j <= i; j++) {
document.write("*");
}
document.write("<br/>");
}
for (var i = x - 1; i >= 1; i--) {
for (var k = 1; k <= x - i; k++) {
document.write(" ");
}
for (var j = 1; j <= i; j++) {
document.write("*");
}
document.write("<br/>");
}
}
<body>
<input type="number" id="num" placeholder="Enter Number">
<br>
<button onclick="clicked()">SUBMIT</button>
</body>
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