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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p>点击按钮获取数组元素的平方根。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> var numbers = [4, 9, 16, 25]; function myFunction() { x = document.getElementById("demo") x.innerHTML = numbers.map(Math.sqrt); } </script> </body> </html>
运行结果
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