L5_彈力球大戰_除錯範例 | JavaScript 程式專案

{"id":183161,"student_id":10,"content":"/**\n * 情境：老師我的程式無法執行...\n * 提示：搜尋關鍵字詞\n */\n\nvar score_left = 0;\nvar score_right = 0;\nvar speed = 5;\n\nforever(function() {\n\n    ball.stepForward(speed); //向前移動\n\n    //當球撞到上下邊界時反彈\n    if (ball.y \u003c 0 || ball.y \u003e 480) {\n        ball.direction = -ball.direction - 180; //上下邊界反彈\n    }\n\n    //當球撞到兩邊擋板時反彈\n    if (ball.touched(p2) || ball.touched(p1)) {\n        ball.direction = -ball.direction + Math.random()*15; //左右擋板反彈\n        speed = speed + 0.5;\n    }\n    \n    if (key.up) {\n        p1.y = p1.y - 10;\n    }\n    if (key.down) {\n        p1.y = p1.y + 10;\n    }\n    if (key.w) {\n        p2.y = p2.y - 10;\n    }\n    if (key.s) {\n        p2.y = p2.y + 10;\n    }\n    \n    //當球掉入右邊邊界\n    if (ball.x \u003c 0) {\n        score_right = score_right + 1; //右邊玩家得分\n        ball.direction = 270;\n    }\n    //當球掉入左邊邊界\n    if (ball.x \u003e 640) {\n        score_left = score_left + 1; //左邊玩家得分\n        ball.direction = 90;\n    }\n    \n    //當球掉入雙方邊界時，重置球\n    if (ball.x \u003c 0 || ball.x \u003e 640) {\n        ball.x = 320;\n        ball.y = 240;\n        speed = 5;\n    }\n    \n    print(score_left, 30, 20, '#157df9', 40);\n    print(score_right, 580, 20, '#fd7e24', 40);\n});","created_at":"2020-08-20T10:15:39.615+08:00","updated_at":"2022-11-02T15:11:32.012+08:00","name":"L5_彈力球大戰_除錯範例","language":"javascript","screenshot":{"url":"https://cdn9.koding.school/uploads/project/screenshot/183161/b230fa3bcc0fafe3f75ee57f07ce202f.jpg"},"parent_id":182996,"plugin":"setBackdrop('bg.jpg');\nvar ball = createSprite(\"ball.png\");\nvar p2 = createSprite({\n    costumes: \"blue.jpg\",\n    x: 10,\n    y: 250\n});\nvar p1 = createSprite({\n    costumes: \"orange.jpg\",\n    x: 631,\n    y: 250\n});\n// =================================//\n\n","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":218,"hashid":"p93sp2zj","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}