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JavaScript 类型化数组 from() 方法
tryjsref_array_from_array
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<!DOCTYPE html> <html> <body> <h1>JavaScript Arrays</h1> <h2>The from() Method</h2> <p>The from() method can return an array from any iterable object.</p> <p>The from() method can return an array from an array:</p> <p id="demo"></p> <script> const myNumbers = [1,2,3,4]; const myArr = Array.from(myNumbers, (x) => x * 2); document.getElementById("demo").innerHTML = myArr; </script> </body> </html>