nodejs输出图形

  function Shape() {
    this.printStr = "";
    return new Shape.prototype.init();
  }
Shape.prototype = {
  //换行
  init: function() {
    return this;
  },
  n: function() {
    this.printStr += "\n";
  },
  //空格
  space: function() {
    this.printStr += " ";
  },
  /*
    第行输出
    type     类型  实心 solid 空心 hollow
    sp       开始的空格数
    mp       字符之间的空格数
    str     字符
    num     次数
  */
  printChar: function(type, sp, mp, str, num) {
    this.clean();
    switch (type) {
      case 'solid':
        for (var i = 0; i < sp; i++) {
          this.space();
        };
        for (var i = 0; i < num; i++) {
          this.printStr += str;
          for (var j = 0; j < mp; j++) {
            this.space();
          }
        }

        break;
      case 'hollow':
        for (var i = 0; i < sp; i++) {
          this.space();
        };
        this.printStr += str;
        for (var i = 0; i < num - 1; i++) {
          this.space();
          for (var j = 0; j < mp; j++) {
            this.space();
          }
        };
        this.printStr = this.deleteLastChar(this.printStr)
        this.printStr += str;
        break;
      default:
    }

    console.log(this.printStr);



    // this.clean();
    // switch (type) {
    //   case 'solid':
    //     for (var i = 0; i < num; i++) {
    //       this.printStr += str;
    //     }
    //     break;
    //   case 'hollow':
    //     this.printStr += str;
    //     num === 2 ? num = 2 : num;
    //     for (var i = 0; i < num - 2; i++) {
    //       this.space();
    //     }
    //     this.printStr += str;
    //     break;
    //   default:
    // }
    // console.log(this.printStr);

  },
  //清空当前printStr;
  clean: function() {
    this.printStr = "";
  },
  deleteLastChar: function(str) {
    return str.substring(0, (str.length - 1));
  },
  /*
  矩形
  type     类型  实心 solid 空心 hollow
  sp       开始的空格数
  mp       字符之间的空格数
  str     字符
  num     次数
  line    行数
  */
  rectangle: function(type, sp, mp, str, num, line) {
    switch (type) {
      case 'solid':
        for (var i = 0; i < line; i++) {
          this.printChar(type, sp, mp, str, num);
          this.n();
        };
        break;
      case 'hollow':
        this.printChar('solid', sp, mp, str, num);
        this.n();
        for (var i = 0; i < line - 2; i++) {
          this.printChar(type, sp, mp, str, num);
          this.n();
        };
        this.printChar('solid', sp, mp, str, num);
        this.n();
        break;
      default:
    }
  },
  /*
  三角形
  type     类型  实心 solid 空心 hollow
  sp       开始的空格数
  mp       字符之间的空格数
  str     字符
  num     次数
  line    行数
  tolerance   公差  必须是大于0的偶数

  */
  triangle: function(type, sp, mp, str, line, tolerance) {
    if (tolerance % 2) {
      console.log("公差必须是大于0的偶数");
      return;
    }
    switch (type) {
      case 'solid':
        for (var i = 1, j = sp, k = line; k > 0; i += tolerance, j -= (tolerance / 2), k--) {
          this.printChar("solid", j, mp, str, i);
        }
        break;
      case 'hollow':
        for (var i = 1, j = sp, k = line; k > 0; i += tolerance, j -= (tolerance / 2), k--) {
          if (k === 1) {
            this.printChar("solid", j, mp, str, i);
          } else {
            this.printChar("hollow", j, mp, str, i);
          }
        }
        break;
      default:
    }
  },
  /*
  梯形
  type     类型  实心 solid 空心 hollow
  sp       开始的空格数
  mp       字符之间的空格数
  str     字符
  num     次数
  line    行数
  tolerance   公差  必须是大于0的偶数

  */
  trapezoid: function(type, sn, sp, mp, str, line, tolerance) {
    if (tolerance % 2) {
      console.log("公差必须是大于0的偶数");
      return;
    }
    switch (type) {
      case 'solid':
        for (var i = sn, j = sp, k = line; k > 0; i += tolerance, j -= (tolerance / 2), k--) {
          this.printChar("solid", j, mp, str, i);
        }
        break;
      case 'hollow':
        for (var i = sn, j = sp, k = line; k > 0; i += tolerance, j -= (tolerance / 2), k--) {
          if (k === 1 || k === line) {
            this.printChar("solid", j, mp, str, i);
          } else {
            this.printChar("hollow", j, mp, str, i);
          }
        }
        break;
      default:
    }
  }

}

Shape.prototype.init.prototype = Shape.prototype;
global.wShape = Shape();

//矩形
// var shape = new Shape();
// shape.rectangle('solid', 0, 5, '*', 5, 5);
// console.log("\n");
// var shapee = new Shape();
// shapee.rectangle('hollow', 0, 5, '#', 5, 5);

//三角形
// var shape = new Shape();
// shape.triangle('solid', 30, 0, "*", 10, 2);
// console.log("\n");
// var shapee = new Shape();
// shapee.triangle('hollow', 30, 0, "#", 10, 2);

//梯形
// var shape = new Shape();
// shape.trapezoid('solid', 5, 30, 0, "*", 10, 2);
// console.log("\n");
// var shapee = new Shape();
// shapee.trapezoid('hollow',5 ,30, 0, "#", 10, 2);

//矩形
wShape.rectangle('solid', 30, 5, '*', 5, 5);
console.log("\n");
wShape.rectangle('hollow', 30, 5, '#', 5, 5);


console.log("\n");
//三角形
wShape.triangle('solid', 30, 0, "*", 10, 2);
wShape.triangle('hollow', 30, 0, "#", 10, 2);


console.log("\n");
//梯形
wShape.trapezoid('solid', 5, 30, 0, "*", 10, 2);
wShape.trapezoid('hollow',5 ,30, 0, "#", 10, 2);

效果