Question

我昨天在MacOS上安装了Docker，想要运行npm并获得： -bash：npm：找不到命令

我需要做些什么才能让它正常工作？ THX。

Answer 1

npm未安装在您正在使用的图片上。

您可以执行以下任一操作：

通过传统方式安装;取决于您正在使用的操作系统。
使用图片，例如official node image 预先安装它。

您可以通过以下方式使用＃2：

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;

 /*

 -Used built in Math trig methods to accomodate angling...looked this up online


 https://stackoverflow.com/questions/30032635/java-swing-draw-a-line-at-a-specific-angle


*/



public class Test extends JFrame {

    public Test() {

        setBounds(100, 100, 800, 600);  //sets the boundary for drawing

    }

    public void drawTree(Graphics g, int x1, int y1, double angle, int depth) {

        System.out.println("x");

        if (depth == 6){
            return; //base case here to prevent infinite recursion..
        }
        else {


            System.out.println("y1");

            //embedded portion '(Math.toRadians(angle) * depth * 10.0)'represents angle...

            int x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * 10.0);  //vertical shift calculated using the Sine...PARSED to int because method drawLine() accepts only ints as params
            int y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * 10.0);  //hor. shift calculated using the Cos..PARSED to int


          //  System.out.println("x2: " + x2);//will reflect the change in vertical shift
            //System.out.println("y2: " + y2);//will reflect change in hor. shift

            g.drawLine(x1, y1, x2, y2);//value x1 equals previous line...in other word, start at where previously left off
            // notice that the end point (x2 and y2) becomes starting point for each successive call


            drawTree(g, x2, y2, angle - 20, depth - 1); //DRAWS LEFT SIDE?

           // drawTree(g, x2, y2, angle + 20, depth - 1); //DRAWS RIGHT SIDE?

        }



        if (depth == 6){
            return; //base case here to prevent infinite recursion..
        }
        else {


            System.out.println("y2");


            int x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * 10.0);  //vertical shift calculated using the Sine...PARSED to int because method drawLine() accepts only ints as params
            int y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * 10.0);  //hor. shift calculated using the Cos..PARSED to int


           // System.out.println("x2: " + x2);//will reflect the change in vertical shift
            //System.out.println("y2: " + y2);//will reflect change in hor. shift

            g.drawLine(x1, y1, x2, y2);//value x1 equals previous line...in other word, start at where previously left off
            // notice that the end point (x2 and y2) becomes starting point for each successive call


           // drawTree(g, x2, y2, angle - 20, depth - 1); //DRAWS LEFT SIDE?

            drawTree(g, x2, y2, angle + 20, depth - 1); //DRAWS RIGHT SIDE?

        }

    }




    public void drawIteratively(Graphics g, int x1A, int y1A, int x1B, int y1B, double angleA, double angleB, int depthA, int depthB){

        while (depthA != 4) {


            int x2A = x1A + (int) (Math.cos(Math.toRadians(angleA)) * depthA * 10.0);
            int y2A = y1A + (int) (Math.sin(Math.toRadians(angleA)) * depthA * 10.0);

            g.drawLine(x1A, y1A, x2A, y2A);   //remember it must continue drawing from where it left off

            angleA = angleA - 20;
            depthA = depthA - 1;

            x1A = x2A;
            y1A = y2A;

        }

        while (depthA != 4) {


            int x2A = x1A + (int) (Math.cos(Math.toRadians(angleA)) * depthA * 10.0);
            int y2A = y1A + (int) (Math.sin(Math.toRadians(angleA)) * depthA * 10.0);

            g.drawLine(x1A, y1A, x2A, y2A);   //remember it must continue drawing from where it left off

            angleA = angleA - 20;
            depthA = depthA - 1;

            x1A = x2A;
            y1A = y2A;

        }

        /*

        while(depthB != 4){


            int x2B = x1B + (int) (Math.cos(Math.toRadians(angleB)) * depthB * 10.0);
            int y2B = y1B + (int) (Math.sin(Math.toRadians(angleB)) * depthB * 10.0);

            g.drawLine(x1B, y1B, x2B, y2B);

            angleB = angleB + 20;
            depthB = depthB - 1;

            x1B = x2B;
            y1B = y2B;

        }
        */

    }






    @Override
    public void paint(Graphics g) {
        g.setColor(Color.BLUE);


       //drawTree(g, 400, 400, -90, 9); //these values corresponding to original line aka trunk during initial method call

        drawIteratively(g, 400, 500, 400,500 ,-90 , -90, 9,9);




    }

    public static void main(String[] args) {

        new Test().setVisible(true);

    }
}

使用Docker MacOS在终端中找不到-bash：npm：命令

1 个答案: