如果选中复选框，则复制值

Question

我需要添加 JavaScript 代码以在此表单上启用自动完成功能。 每当检查复选框时，代码应自动从运输名称和运输Z963AB0BBEA32F1F9D19D19D19AFB00D08BE14DZ中复制值，并将其计费到帐单名称中，并计费Z963AB0BBEA32F1F9D1F9D19D19D19AFB00D08BE14DZ。 如果未选中该复选框，则帐单名称和帐单 Zip 应为空白 go。 为什么我的代码不起作用？

我的 HTML 和 JS 代码如下：

 function billingFunction() { if (document.getElementById('same').checked) { var shipinfo = document.getElementById('shippingName', 'shippingZip').value; var billinfo = document.getElementById('billingName', 'billingZip').value; shipinfo = billinfo; } else { document.getElementById('billingName', 'billingZip').value = ''; } }

 <h1>JavaScript</h1> <p> Whenever the checkbox is checked, the code should automatically copy the values from Shipping Name and Shipping Zip into the Billing Name and Billing Zip. If the checkbox is unchecked, the Billing Name and Billing Zip should go blank.</p> <form> <fieldset> <legend>Shipping Information</legend> <label for="shippingName">Name:</label> <input type="text" name="shipName" id="shippingName" required><br/> <label for="shippingZip">Zip code:</label> <input type="text" name="shipZip" id="shippingZip" pattern="[0-9]{5}" required><br/> </fieldset> <input type="checkbox" id="same" name="same" onchange="billingFunction()" /> <label for="same">Is the Billing Information the Same?</label> <fieldset> <legend>Billing Information</legend> <label for="billingName">Name:</label> <input type="text" name="billName" id="billingName" required><br/> <label for="billingZip">Zip code:</label> <input type="text" name="billZip" id="billingZip" pattern="[0-9]{5}" required><br/> </fieldset> <input type="submit" value="Verify" /> </form>

Answer 1

function billingFunction() {
  if (document.getElementById('same').checked) {
    var shipinfo = document.getElementById('shippingName').value;
    var billinfo = document.getElementById('shippingZip').value;

    document.getElementById('billingName').value = shipinfo;
    document.getElementById('billingZip').value = billinfo;
  } else {
    document.getElementById('billingName').value = '';
    document.getElementById('billingZip').value = '';
  }
}

用这个