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<!DOCTYPE html> <html> <body> <h2>JavaScript 箭头函数</h2> <p>这个例子展示了箭头函数的语法，以及如何使用它。</p> <p id="demo"></p> <script> var hello; hello = () => { return "Hello World!"; } document.getElementById("demo").innerHTML = hello(); </script> </body> </html>