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<!DOCTYPE html> <html> <body> <h2>JavaScript 箭头函数</h2> <p>这个例子表明，如果箭头函数中只有一个参数，则可以跳过括号。</p> <p id="demo"></p> <script> var hello; hello = val => "Hello " + val; document.getElementById("demo").innerHTML = hello("Universe!"); </script> </body> </html>