实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>手册网教程(shouce.ren)</title>
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</head>
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<body>
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​
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<p>点击按钮获取数组元素的平方根。</p>
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<button onclick="myFunction()">点我</button>
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<p id="demo"></p>
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<script>
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var numbers = [4, 9, 16, 25];
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function myFunction() {
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    x = document.getElementById("demo")
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    x.innerHTML = numbers.map(Math.sqrt);
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}
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</script>
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​
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</body>
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</html>