“预计‘this’将被类方法使用”

Question

我收到来自 ESlint 的错误，但我不明白为什么。我读过这些：

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• 期望类方法使用“this”
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• Eslint：期望类方法使用“this”
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• 如何修复“警告预期“this”将由类方法使用”eslint 错误？
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和这个：

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• https://eslint.org/docs/rules/class-methods-use-this
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我仍然不明白我做错了什么。

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我的课

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/* eslint-disable no-plusplus */\r\n/* eslint-disable no-undef */\r\nclass Player {\r\n  constructor(imagePlayer, name, score, positionY, positionX) {\r\n    this.imagePlayer = imagePlayer;\r\n    this.name = name;\r\n    this.score = score;\r\n    this.x = positionX;\r\n    this.y = positionY;\r\n  }\r\n\r\n  drawPlayer() {\r\n    app.map.mapGame[this.y][this.x] = this.imagePlayer;\r\n  }\r\n\r\n  obstacle(y, x) {\r\n    let colision = false;\r\n    if (app.map.mapGame[y][x] === 1) {\r\n      console.log("evaluaci\xc3\xb3n");\r\n      colision = true;\r\n    }\r\n    return colision;\r\n  }\r\n\r\n  lastPosition(oldPosition, direction) {\r\n    if (direction === left || direction === right) {\r\n      app.map.mapGame[this.y][this.x - oldPosition] = 0;\r\n    } else {\r\n      app.map.mapGame[this.y - oldPosition][this.x] = 0;\r\n    }\r\n  }\r\n\r\n  // movements players\r\n  movement(direction) {\r\n    switch (direction) {\r\n      case up:\r\n        if (this.y > 0) {\r\n          if (this.obstacle(this.y - 1, this.x) === false) {\r\n            this.y--;\r\n            this.lastPosition(-1, direction);\r\n          }\r\n        }\r\n        break;\r\n\r\n      case down:\r\n        if (this.y < 9) {\r\n          if (this.obstacle(this.y + 1, this.x) === false) {\r\n            this.y++;\r\n            this.lastPosition(+1, direction);\r\n          }\r\n        }\r\n        break;\r\n\r\n      case left:\r\n        if (this.x > 0) {\r\n          this.x--;\r\n          this.lastPosition(-1, direction);\r\n        }\r\n        break;\r\n\r\n      case right:\r\n        if (this.x < 14) {\r\n          this.x++;\r\n          this.lastPosition(+1, direction);\r\n        }\r\n        break;\r\n\r\n      default:\r\n        console.log("muro");\r\n        break;\r\n    }\r\n  } // movement\r\n}

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错误：
\n 预期类方法\'obstacle 使用\'this\'

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障碍法并没有解决全部情况，仅解决其中的两个问题。

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Answer 1

linter 抱怨说，不使用调用它的实例的方法 ( this) 首先就不应该是实例方法。这是一个不好的做法。

你要么

• 应该使它成为一个static方法，被称为Player.obstacle(x, y)（并且可能被重命名为checkGlobalMapForObstacle）
• 应该将该方法移动到Map它所属的类，因为它正在根据地图内容检查坐标 ( this.mapGame[x][y])。