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<!DOCTYPE html> <html> <body> <h2>JavaScript Array.forEach()</h2> <p>为每个数组元素调用一次函数。</p> <p id="demo"></p> <script> var txt = ""; var numbers = [45, 4, 9, 16, 25]; numbers.forEach(myFunction); document.getElementById("demo").innerHTML = txt; function myFunction(value, index, array) { txt = txt + value + "<br>"; } </script> </body> </html>