javascript - 创建一个大字母 X

Question

我正在尝试创建一个脚本，允许用户输入一定数量的行，然后打印一个大字母 X，到目前为止，我能够将其打印为 v 形状，但我正在努力获取其余的x 在一起。

rows = 0;
space = " ";
var user_input = parseFloat(prompt("Enter how many rows:", 0));
while (rows < user_input) {
  space_counter = 0;
  while (space_counter < rows) { //process1
    document.write(space);
    space_counter++;
  }
  document.write("x"); //process2
  rows++;
  midspace_counter = 0;
  while (midspace_counter < user_input - rows) { //process3
    document.write(space + space);
    midspace_counter++;
  }
  document.write("x<br>"); //process4
  rows++;
}

Answer 1

我会怎么做:

 let result = "";
 const maxRow = +prompt("how many rows?");
 // Knowing the half size of our x might be useful
 const half = (maxRow - 1) / 2;

 for(let row = 0; row < maxRow; row++){
   // For e.g. maxRow = 7 this will be 3 2 1 0 1 2 3
   const midspace = Math.abs(half - row);
   const pad = maxRow - midspace - 1;// 1 = "x"
   // \n means newline      
   result += " ".repeat(pad) + "x" + " ".repeat(midspace * 2) + "x\n";
}

然后您只需将其附加到文档中即可。