<html><head><meta charset="utf-8"><title>手册网教程(shouce.ren)</title></head><body><p>点击按钮将数组中的所有值乘以特定数字。</p><p>乘以: <input type="number" id="multiplyWith" value="10"></p><button onclick="numbers.forEach(myFunction)">点我</button><p>计算后的值: <span id="demo"></span></p><script>var numbers = [65, 44, 12, 4];function myFunction(item,index,arr) { arr[index] = item * document.getElementById("multiplyWith").value; demo.innerHTML = numbers;}</script></body></html>