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<!DOCTYPE html> <html> <body> <h2>JavaScript 箭头函数</h2> <p>此示例显示了一个没有括号或 return 关键字的箭头函数。</p> <p id="demo"></p> <script> var hello; hello = () => "Hello World!"; document.getElementById("demo").innerHTML = hello(); </script> </body> </html>