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我正在尝试使用clamp.js，但我马上就遇到了一个错误。这是我的代码

 <!DOCTYPE html>
<html lang="en">
    <head>
        <title>test</title>

        <script src="js/plugin/clamp.min.js"></script>


    </head>

    <body>

        <div id="test" style="width:200px; height:200px;">
            AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA 
        </div>

        <script>
            var e = document.getElementById("test");
            var r = $clamp(e, {clamp: 1, useNativeClamp :false});
            console.log(r);
        </script>

    </body>

</html>

我进入TypeError: a.lastChild is null[Learn More]了 Firefox 和Uncaught TypeError: Cannot read property 'children' of nullchrome。

这是我使用的文件clamp.min.js。

有谁知道可能是什么问题？

谢谢

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