Uncaught (in promise) ReferenceError: TMap is not defined

问题描述

运行报错Uncaught (in promise) ReferenceError: TMap is not defined
TMap为何找不到呀？

2 回复

请问有解决方案了吗？


The error Uncaught (in promise) ReferenceError: TMap is not defined indicates that the JavaScript code is trying to use a variable or object named TMap, but it hasn’t been defined or loaded yet. This typically happens when:

  1. The TMap library is not loaded: If TMap is a third-party library (e.g., Tencent Maps JavaScript API), you might have forgotten to include the script tag that loads the library in your HTML file.

  2. The script is executed before the library is loaded: If the script that uses TMap is executed before the library is fully loaded, the TMap object will not be available.

  3. Typo or incorrect usage: There might be a typo in the variable name or the library might not be initialized correctly.

How to Fix It

1. Ensure the Library is Loaded

If TMap is part of a third-party library (e.g., Tencent Maps), make sure you include the script tag to load the library in your HTML file. For example:

<script src="https://map.qq.com/api/gljs?v=1.exp&key=YOUR_API_KEY"></script>

Replace YOUR_API_KEY with your actual API key.

2. Wait for the Library to Load

If the script is executed before the library is loaded, you can use an event listener to ensure the library is loaded before using it. For example:

window.onload = function() {
    // Your code that uses TMap
    const map = new TMap.Map(document.getElementById('map'), {
        center: new TMap.LatLng(39.984104, 116.307503),
        zoom: 11
    });
};

Alternatively, if the library provides a callback or promise-based loading mechanism, use that:

TMap.load().then(() => {
    const map = new TMap.Map(document.getElementById('map'), {
        center: new TMap.LatLng(39.984104, 116.307503),
        zoom: 11
    });
});

3. Check for Typos

Ensure that you are using the correct variable name and that the library is initialized properly. For example, if the library is supposed to be initialized with a specific method, make sure you are calling that method.

4. Debugging

If the issue persists, check the browser’s developer console for any additional errors or warnings that might give you more information about why TMap is not defined.

Example

Here’s a complete example of loading and using the Tencent Maps API:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Tencent Map Example</title>
    <script src="https://map.qq.com/api/gljs?v=1.exp&key=YOUR_API_KEY"></script>
</head>
<body>
    <div id="map" style="width: 100%; height: 500px;"></div>
    <script>
        window.onload = function() {
            const map = new TMap.Map(document.getElementById('map'), {
                center: new TMap.LatLng(39.984104, 116.307503),
                zoom: 11
            });
        };
    </script>
</body>
</html>
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