yp的=0 stx[]=0.02+ Math. random(/10 sty[i]=0.7+ Math. random flag[i]=(Math. random(<0.5)?1: 0; doc_width document body. clientWidtl doc _height document body. clientHeight if(flag[i] A dx[] += st else dx[]-= stx[i] if(Math. abs(dx[i)> Math. PI)( yp[]+=Math. abs(amy[i]*dx[i]); xp[]+=amx[i]*dx[] dx[]=0;yp[i] = 0; stx[i] = 0.02 + Math.random()/10; sty[i] = 0.7 + Math.random(); flag[i]=(Math.random()<0.5)?1:0; doc_width = document.body.clientWidth; doc_height = document.body.clientHeight; } if (flag[i]) dx[i] += stx[i]; else dx[i] -= stx[i]; if (Math.abs(dx[i]) > Math.PI) { yp[i]+=Math.abs(amy[i]*dx[i]); xp[i]+=amx[i]*dx[i]; dx[i]=0;