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<!DOCTYPE html> <html> <body> <h2>JavaScript 箭头函数</h2> <p>箭头函数在 IE11 或更早版本中不受支持。</p> <p id="demo"></p> <script> const x = (x, y) => { return x * y }; document.getElementById("demo").innerHTML = x(5, 5); </script> </body> </html>