“Uncaught ReferenceError: this is not defined” in

2019-01-04 02:01发布

站内问答 / JavaScript
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I am playing with the new stuff in JavaScript/ES6. I get an Uncaught ReferenceError: this is not defined(...) player.js:5 in my code. As far as I see, there are no errors here! Is this a bug? Any workarounds?

index.html

<html>
    <head>
        <script type="text/javascript" src="js/entity.js"></script>
        <script type="text/javascript" src="js/player.js"></script>
        <link href="css/style.css" rel="stylesheet" type="text/css">
        <title>Test</title>
    </head>
    <body>
        <canvas id="screen" width=500 height=500></canvas>
        <script type="text/javascript">initialize();</script>
    </body>
</html>

entity.js

"use strict";

class Entity {
    constructor() {
        console.log("Entity");
    }
}

player.js

"use strict";

class Player extends Entity {
    constructor() {
        console.log("Created"); // <- error here
    }
}

1条回答
闹够了就滚
2楼-- · 2019-01-04 02:39

This is a fact of the new class syntax. Your subclass needs to call super() in order for the class to be properly initialized, e.g.

super(arg1, arg2, argN);

with whatever arguments the parent constructor needs.

It is required that, if execution reaches the end of a constructor function, the value of this needs to have been initialized to something. You either need to be in a base class (where this is auto-initialized), have called super() so this is initialized, or returned an alternative object.

class Player extends Entity {
  constructor() {
    super();
    console.log("Created"); ;// error here
  }
}

You can think of it like constructor functions kind of have an automatic return this at the end of them.

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