Uncaught SyntaxError: Unexpected token 'export

Uncaught SyntaxError: Unexpected token 'export'错误通常出现在Vue项目中，当在index.html中引入一个结构如下的js文件时：

const fn = (() => {
    console.log("jinlaile");
})();
export default fn;

这个错误是因为这段代码使用了ES6的模块导出语法`export default`，而浏览器默认不支持ES6模块导出。解决这个问题的方法是在index.html文件的`<script>`标签中添加`type="module"`属性，像下面这样：

<script src="static.js" type="module"></script>

这样可以告诉浏览器该脚本是一个ES6模块，从而正确解析`export default`语法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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