How can I change the placeholder text of an input element?
例如，我有3个文本类型的输入.
<input type="text" name="Email" placeholder="Some Text">
<input type="text" name="First Name" placeholder="Some Text">
<input type="text" name="Last Name"placeholder="Some Text">
How can I change the Some Text text using JavaScript or jQuery?
如果您想使用Javascript，那么您可以使用getElementsByName()方法来 Select input个字段，并 for each 字段更改placeholder个字段…请参见以下代码.
document.getElementsByName('Email')[0].placeholder='new text for email';
document.getElementsByName('First Name')[0].placeholder='new text for fname';
document.getElementsByName('Last Name')[0].placeholder='new text for lname';
Otherwise use jQuery:
$('input:text').attr('placeholder','Some New Text');