Question

只是想知道create-react-app如何使用.js文件而不是.jsx来获取jsx标记。是因为特殊的webpack配置吗？顺便问一下，在哪里可以找到使用create-react-app创建的项目的webpack和babel配置？

Answer 1

文件扩展名没有什么特别之处;这只是通过Babel运行的问题。例如：

//---------------------------------------------------------------------------
const int _gx=15;           // hex grid size
const int _gy=15;
const int _hy=(_gy+1)<<1;   // hex points size
const int _hx=(_gx+1);
double hex[_hy][_hx][3];    // hex grid points
//---------------------------------------------------------------------------
void hexgrid_init(double r) // set hex[][][] to planar hex grid points at xy plane
    {
    double x0,y0,x,y,z,dx,dy,dz;
    double sx,sy,sz;
    int i,j;
    // hex sizes
    sz=sqrt(8.0)*r/double(_hy);
    sx=sz*cos(60.0*deg);
    sy=sz*sin(60.0*deg);

    // center points arrounf (0,0)
    x0=(0.5*sz)-double(_hy/4)*(sz+sx);
    y0=-double(_hx)*(sy);
    if (int(_gx&1)==0) x0-=sz+sx;
    if (int(_gy&1)==0) y0-=sy; else y0+=sy;

    for (y=y0,i=0;i<_hy;i+=2,y+=sy+sy)
     for (x=x0,j=0;j<_hx;j++,x+=sz)
        {
        hex[i][j][0]=x;
        hex[i][j][1]=y;
        hex[i][j][2]=0.0;
        x+=sz+sx+sx; j++; if (j>=_hx) break;
        hex[i][j][0]=x;
        hex[i][j][1]=y;
        hex[i][j][2]=0.0;
        }

    for (y=y0+sy,i=1;i<_hy;i+=2,y+=sy+sy)
     for (x=x0+sx,j=0;j<_hx;j++,x+=sx+sx+sz)
        {
        hex[i][j][0]=x;
        hex[i][j][1]=y;
        hex[i][j][2]=0.0;
        x+=sz; j++; if (j>=_hx) break;
        hex[i][j][0]=x;
        hex[i][j][1]=y;
        hex[i][j][2]=0.0;
        }

    }
//---------------------------------------------------------------------------
void hexgrid_half_sphere(double r0) // convert planar hex grid to half sphere at (0,0,0) with radius r0
    {
    int i,j;
    double x,y,z,a,l;
    for (i=0;i<_hy;i++)
     for (j=0;j<_hx;j++)
        {
        x=hex[i][j][0];
        y=hex[i][j][1];
        z=hex[i][j][2];
        l=sqrt(x*x+y*y);    // distance from center on xy plane (arclength)
        a=l/r0;             // convert arclength to angle
        z=r0*cos(a);        // compute z coordinate (sphere)
        if (z>=0.0)         // half sphere
            {
            a=r0*sin(a)/l;
            }
        else{               // turn hexes above half sphere to cylinder
            z=0.5*pi*r0-l;
            a=r0/l;
            }
        x*=a;
        y*=a;
        hex[i][j][0]=x;
        hex[i][j][1]=y;
        hex[i][j][2]=z;
        }
    }
//---------------------------------------------------------------------------
void hex_draw(int x,int y,GLuint style)     // draw hex x = <0,_gx) , y = <0,_gy)
    {
    y<<=1;
    if ((x&1)==0) y++;
    if ((x<0)||(x+1>=_hx)) return;
    if ((y<0)||(y+2>=_hy)) return;
    glBegin(style);
    glVertex3dv(hex[y+1][x  ]);
    glVertex3dv(hex[y  ][x  ]);
    glVertex3dv(hex[y  ][x+1]);
    glVertex3dv(hex[y+1][x+1]);
    glVertex3dv(hex[y+2][x+1]);
    glVertex3dv(hex[y+2][x  ]);
    glEnd();
    }
//---------------------------------------------------------------------------

那将通过Babel和React预设同时运行JS和JSX（以及JS？）。

Webpack和Babel配置在create-react-app中。

您可以通过以下方式弹出它们：

hexgrid_init(1.5); hexgrid_half_sphere(1.0); int x,y; glColor3f(0.0,0.2,0.3); for (y=0;y<_gy;y++) for (x=0;x<_gx;x++) hex_draw(x,y,GL_POLYGON); glLineWidth(2); glColor3f(1.0,1.0,1.0); for (y=0;y<_gy;y++) for (x=0;x<_gx;x++) hex_draw(x,y,GL_LINE_LOOP); glLineWidth(1);让他们“外化”，但只有在你真正想要时才这样做。

https://github.com/facebookincubator/create-react-app#user-content-converting-to-a-custom-setup

create-react-app中的JSX文件

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